Thicker Viscosity oil for GM ENGINES ???
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Forum Name: Shops, Barns, Varmints, and Trucks
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=206477
Printed Date: 18 Jun 2025 at 1:57pm
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Topic: Thicker Viscosity oil for GM ENGINES ???
Posted By: steve(ill)
Subject: Thicker Viscosity oil for GM ENGINES ???
Date Posted: 28 Apr 2025 at 4:28pm
A dealer bulletin obtained by GM-Trucks forum users, all affected units (MY2021-2024) are currently up for recall, including those in the inventory units. While the dealer bulletin only contains instructions for the dealers that will work on the trucks, GM has confirmed in a statement that it will be issuing a voluntary recall "to address this matter as quickly as possible."
There's A Remedy For Those That Pass Dealer InspectionsFor the uninitiated, the L87 V8's woes lie in the connecting rod and/or crankshaft components in affected vehicles having unspecified manufacturing defects. When these components fail, it could lead to loss of propulsion or complete engine failure, which can be hazardous or even life-threatening if they occur while in transit. We've found several cases of this issue before, with https://carbuzz.com/why-the-feds-are-concerned-about-877-thousand-gm-v8-failures/" rel="nofollow - some instances happening while on the highway , while others reportedly https://carbuzz.com/gm-62-liter-v8-engine-failure-at-4-miles-looks-like/" rel="nofollow - bombing as early as 4 miles . https://carbuzz.com/biggest-recalls-in-automotive-history/" rel="nofollow - - - : - GM has provided a remedy for the problem, although it's incomplete for now. - - . Engine Replacements Could Happen, But...On the other hand, those vehicles that will not pass the inspection will be "quarantined" and should not be sold/delivered to the customer. It's unclear what will happen to these vehicles, with the documents only stating that "Additional information will be provided by General Motors in the near future." ------------- Like them all, but love the "B"s. |
Replies:
Posted By: NEVER green
Date Posted: 29 Apr 2025 at 8:31am
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Wont help the lifter failures, did they ever recall that? ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: steve(ill)
Date Posted: 29 Apr 2025 at 9:03am
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V8's woes lie in the connecting rod and/or crankshaft components in affected vehicles having unspecified manufacturing defects --- but if it has not failed yet, they will put 40 wt oil in place of the 20 wt ..???? ------------- Like them all, but love the "B"s. |
Posted By: Dave H
Date Posted: 29 Apr 2025 at 9:17am
God bless those engineers.  I am gonna stick with my Ferd (as I recall a famous person used to call them}] 
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Posted By: Coke-in-MN
Date Posted: 30 Apr 2025 at 1:58pm
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Seems recall is on the 6.2 Gas V8 engines , not the 6.0 or other engines , to meet millage specs the light weight oil was the new grade to reduce friction , The old idea of heavy oil for longer life has changed in new engines . 10/30 for many years and now 0/20 seems to be the grade called for ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Lars(wi)
Date Posted: 30 Apr 2025 at 3:44pm
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Is the lubrication problem with the cold oil at start-up, or thin hot oil? ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: steve(ill)
Date Posted: 30 Apr 2025 at 4:47pm
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THICKER oil is a good thing... but thats NOT what the complain says... Manufacturing defects in the connecting rod and/or crankshaft engine components "can lead to engine damage and engine failure," according to documents https://static.nhtsa.gov/odi/rcl/2024/RMISC-24V797-1898.pdf" rel="nofollow - posted Tuesday by the National Highway Traffic Safety Administration. The recall comes amid an https://static.nhtsa.gov/odi/inv/2025/INOA-PE25001-10002.pdf" rel="nofollow - investigation by U.S. auto safety regulators following https://www.cbs8.com/article/news/nation-world/gm-engine-safety-failures-investigation/507-6c022b65-31de-4314-84e3-dde9200bbb86" rel="nofollow - reports of engine failure in GM vehicles, including the company's best-selling Silverado. The NHTSA in January said it was investigating an estimated 877,710 vehicles after receiving 39 complaints from users of GM vehicles equipped with L87 V8 engines. ------------- Like them all, but love the "B"s. |
Posted By: tadams(OH)
Date Posted: 01 May 2025 at 7:59am
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The ad I seen said they just stop running, could be in the middle of the road |
Posted By: SteveM C/IL
Date Posted: 01 May 2025 at 9:09am
| I heard they tend to break a rod and depending on position of things can lock engine. Happened to me 47 yrs ago when a 327 broke a rod bolt and came apart. Instant lock at 110 and the torque converter takes a while to decouple so rear tires sliding. Glad it was daylight and sober. |
Posted By: HudCo
Date Posted: 01 May 2025 at 9:47am
| lets be fair now back in the 327 days , they were all ran right to the point of the valves floating and a few passes just out of town every saturday night just be fore them black and white cars showed up to mess up the fun |
Posted By: SteveM C/IL
Date Posted: 01 May 2025 at 1:06pm
| Yeah everything around here got the 3863151 350hp 327 hydraulic cam. Nice thump and ran good. |
Posted By: Codger
Date Posted: 01 May 2025 at 2:05pm
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Don't remember any numbers but installed a lot of Isky, and Crane "Fireball" cams back in those days. Had a 69 Z-28 Camaro w/302 and it had a "Duntov 30/30" cam installed.
------------- That's All Folks! |
Posted By: DMiller
Date Posted: 01 May 2025 at 6:23pm
| Built a many Home Built 301s from old 327s. Would wind until valves floated Repeatedly, unlike 327 dropping rods. |
Posted By: steve(ill)
Date Posted: 01 May 2025 at 7:01pm
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wonder what and why something is failing in the new 6.2 motor ..... you would not think people are REVVING up a NEW truck motor till a rod breaks ??? ------------- Like them all, but love the "B"s. |
Posted By: NEVER green
Date Posted: 01 May 2025 at 7:05pm
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I think its the variable speed oil pump. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Posted By: Lars(wi)
Date Posted: 01 May 2025 at 7:50pm
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If I had one these ‘jewels’, I guess the best thing to do, would be go down to the local co-op and get a case of 30w low ash engine oil a new filter. Pray for the best? ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: Codger
Date Posted: 02 May 2025 at 8:25am
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Yep, small journal 327 block with splayed main caps and 283 forged crank along with Milodon, or Pink bushed and floating rods was one hot ticket in those days. 100 octane premium gas, (readily available then) and it was off to the races.
------------- That's All Folks! |
Posted By: Coke-in-MN
Date Posted: 02 May 2025 at 9:41am
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Ah Yes them old days - my 65 Olds 442 - 400 cu in would rev until points floated around red line on tack. Father in law gave me a set of points (Delco) he bought from someone - several he used- well put them in the 443 as kept the RPM from going to high - floated at about 3200 RPM , were heavy duty truck points with contacts about twice the size of standard points - ran them about 2 days and figured out why it quit preforming ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Coke-in-MN
Date Posted: 02 May 2025 at 9:46am
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Back a few years 10/40 oil came under problems in many GM engines as formulated in a way it lost lubricity properties . Took a while for GM and others to say 10/30 - year or so later was approved again . Now I use 20/50 racing oil in my Motorcycles -formulation seems to work properly in Air Cooled engines . ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Coke-in-MN
Date Posted: 02 May 2025 at 9:53am
GM Explains Why 6.2L V8 L87 Engine Recall Doesn’t Apply To 2019, 2020 VehiclesThe naturally aspirated https://gmauthority.com/blog/gm/gm-engines/l87/" rel="nofollow - 6.2L V8 L87 gasoline engine is a staple of GM’s full-size SUV and truck lineup, but now, the L87 is facing heightened scrutiny in the wake of a new National Highway Traffic Safety Administration (NHTSA) https://gmauthority.com/blog/2025/01/nhtsa-opens-investigation-regarding-gm-6-2l-v8-engine-failures/" rel="nofollow - investigation into alleged engine failures. Per the https://gmauthority.com/blog/category/business/quality/nhtsa/" rel="nofollow - NHTSA , owners have complained of bearing failure that could result in engine seizure or a connecting rod breaching the engine block, with an estimated 878,000 vehicles potentially affected across the https://gmauthority.com/blog/gm/chevrolet/" rel="nofollow - Chevy , https://gmauthority.com/blog/gm/cadillac/" rel="nofollow - Cadillac , and https://gmauthority.com/blog/gm/gmc/" rel="nofollow - GMC brands. Now, however, GM has clarified why vehicles built between the 2019 to 2020 model years are not included in its safety most recent https://gmauthority.com/blog/2025/04/chevy-silverado-gmc-sierra-recalled-for-6-2l-v8-engine-loss-of-propulsion/" rel="nofollow - safety recall . As it turns out, GM formed its own internal product investigation on January 16th, 2025, immediately after the launch of NHTSA investigation. Through a detailed analysis of field data and teardown inspections, GM’s engineering team identified a specific build window between March 1st, 2021, and May 31st, 2024, during which an increased rate of engine failure was tied to specific manufacturing defects. The investigation uncovered two main culprits behind the failures – first, there was evidence of rod-bearing damage resulting from sediment contamination in the crankshaft oil galleries and connecting rods. Second, some crankshafts produced during this period exhibited out-of-spec dimensions and inadequate surface finishes. These combined flaws can lead to accelerated bearing wear, which in turn may cause severe engine damage or outright failure. As a result, GM has initiated a voluntary safety recall for certain 2021-through-2024 model year vehicles equipped with the L87 V8 engine. Models potentially affected include the https://gmauthority.com/blog/gm/chevrolet/silverado/chevrolet-silverado-ld-light-duty/" rel="nofollow - Chevy Silverado 1500 , https://gmauthority.com/blog/gm/gmc/sierra/" rel="nofollow - GMC Sierra 1500, https://gmauthority.com/blog/gm/chevrolet/tahoe/" rel="nofollow - Chevy Tahoe and https://gmauthority.com/blog/gm/chevrolet/suburban/" rel="nofollow - Suburban , https://gmauthority.com/blog/gm/gmc/yukon/" rel="nofollow - GMC Yukon and https://gmauthority.com/blog/gm/gmc/yukon-xl/" rel="nofollow - Yukon XL , and the https://gmauthority.com/blog/gm/cadillac/escalade/" rel="nofollow - Cadillac Escalade and https://gmauthority.com/blog/gm/cadillac/escalade-esv/" rel="nofollow - Escalade ESV . Considering all of the above, the scope of the safety recall appears to be based on manufacturing data and failure trends that were not present in 2019 or 2020 builds, and thus, vehicles between the 2019 and 2020 model years were not included. As covered previously, the original NHTSA investigation stems from 39 consumer complaints citing engine seizures or engine failure, with no accidents or injuries on record. GM’s own investigation identified 12 potentially related alleged crashes and 12 potentially related alleged injuries in the U.S. All ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Coke-in-MN
Date Posted: 03 May 2025 at 2:11pm
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https://www.facebook.com/reel/1071272781489794%20" rel="nofollow - https://www.facebook.com/reel/1071272781489794
Seems they now think it's the variable valve timing mode creating the problem as even earlier engines which have it are wiping out cams , lifters , and engines but will not admit there is any problems as the recall would bankrupt GM trying to replace all . Another FUEL SAVINGS mandate gone WRONG meeting the ideas of politicians to save the planet from gas emissions ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: DMiller
Date Posted: 04 May 2025 at 5:30am
| Reminiscent of the 8/6/4 Cadillacs of the 1980s, another MAJOR Joke. |
Posted By: DMiller
Date Posted: 04 May 2025 at 6:38am
| On the Oil value, what we found DECADES ago as to Additives in engine oils(STP, LUCAS), extreme Lubrication properties were NOT a Plus, Roller Cam Systems as with 99% of all diesels today require a certain quality of Contact Friction otherwise Rollers do not 'Roll' they Scoot, where in doing so they Strip the Oil until Can Roll again, causes premature cam damage, roller flat spotting, debris in oiling systems. Saw it on Gas Engines set up for racing where dropped back, Back in the day, to 10w oils to allow that contact Rolling. Engine Bearings of Babbit need only have an oil wedge to preclude Contact damage same for wrist pins, can still achieve that with Light Weight oils. |
Posted By: Codger
Date Posted: 04 May 2025 at 7:06am
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I have a 2011 Dodge Ram with hemi engine in the shop now needing an engine because of the cylinder deactivation apparatus going bad. They call it MDS which is multiple displacement system. Basically solenoids disable the valve system on four cylinders via oil pressure and the ECM cuts fuel delivery to the disabled cylinders while boosting delivery to other to maintain power and smoothness to driver. This one initially needed a cam and lifters as solenoids were just replaced after failure. The grit from the parts grinding away found their way into the engine bearings taking them out. More government mandated bull  that has a high failure rate. ------------- That's All Folks! |
Posted By: Coke-in-MN
Date Posted: 04 May 2025 at 2:55pm
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Remember a commercial from the 50's by Chrysler - 22 MPG with a Power Dome V8 Then from a simple slant 6 engine or a 6 cyl stove bolt chev the fuel use was not that bad . We have come a long way from many things when a 20 or 30 amp output generator or alternator was enough to now 180 Amp needed to run the electric draw . ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: SteveM C/IL
Date Posted: 04 May 2025 at 11:21pm
| Wouldn't it be shocking to know what the EPA has cost every American. The list of involvement would be discovered to be beyond staggering and every bit of it has a cost. The production of tin can cars to raise CARB numbers has killed how many? Kid had a old Ford diesel dually but drove 30 miles to work and back each day. Got him an S10 to drive. Guy in a utility bed pickup crossed centerline and killed him. Offender walked away. |
Posted By: DMiller
Date Posted: 05 May 2025 at 4:38am
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Best Guess estimates have noted in some Car Mags, that Environmental Gadgets and designs even as Autos or Engines can last for Hundreds of thousands of miles have cost Consumers Tens of Thousands of Dollars for next to NOTHING in results. Biggest Scam there ever was is ZERO Emission Engines, NO SUCH BEAST. Yes can add Converters and Particle traps HOWEVER, those require periodic Maintenance to continue to function, Cat Converters on Gas engines are Only warranted to 5 years 50,000miles as the catalyst Beds deplete, on large Diesels even regeneration at 40-60,000miles these are only warranted to 500,000 which is point of depletion. Sensors are dysfunctional at as low as 25-50,000 miles, are $1500 a pop on the big SCR/DOC/DPF systems, are THREE currently installed, paid for by the Consumer with Purchase Pricing Increases annually. All these products are produced OVERSEAS, primarily in Nations that DO NOT USE THEM. Cost in end run to consumers is Thousands ANNUALLY in Consumer Prices for ALL products shipped, machines produced for purchase increases. Emissions do NOT cease, are NOT reduced to ZERO, when Accelerate in a car/truck, the heat is not present to reduce the end emissions, ONLY In STEADY STATE engine Speed or auto/truck power development as on a Dynamometer or sitting in a Shop bay at Specified RPM rates will these machines deliver a Next to negligible emitted product. Is all a game of Smoke and Mirrors to show the world WE are reducing a footprint that means NADA ZILCH NOTHING at the end of the day. Humans produce LESS THAN 10% of ALL emitted "Bad for Humans" products. Nature produces the Most.
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