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bigbirdww 
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Joined: 20 Aug 2021
Location: Ipswich MA
Points: 23
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 Topic: Motor and transmission oil substitute
Posted: 27 Jan 2022 at 7:44am |
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My 48 AC-C calls for SAE 20 motor oil and transmission oil which I can not find. What are good substitutes?
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Tbone95
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Joined: 31 Aug 2012
Location: Michigan
Points: 11964
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Posted: 27 Jan 2022 at 8:04am |
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Any oil you buy today is going to be far superior to the best available in 1948.
I would say 10W 30 would work good for the engine, and universal tractor oil in the tranny.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 27 Jan 2022 at 8:16am |
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Tbone is right. A good 10w30 in the engine ( 4 quarts) and Universal Hydraulic/ Transmission fluid in the transmission/ pto/ hydraulic case ( 7-8 quarts) .
Edited by steve(ill) - 27 Jan 2022 at 8:17am
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Like them all, but love the "B"s.
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bigbirdww
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Joined: 20 Aug 2021
Location: Ipswich MA
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Posted: 27 Jan 2022 at 11:17am |
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Thanks for the reply and I will try the 10-30. What would you use for the final drive. Cant find 145w. Thanks
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1948 AC-C
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Greg (Hillsboro, OH)
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Joined: 11 Sep 2009
Location: Hillsboro, OH
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Posted: 27 Jan 2022 at 11:31am |
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in old engines such as this, would it be beneficial to use a non-detergent oil so as to not loosen years of crud?
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jvin248
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Joined: 17 Jan 2022
Location: Detroit
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Posted: 27 Jan 2022 at 11:38am |
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Getting harder to find '10w'-anything anymore as many new vehicles are 5w- and even 0w- synthetics.
When I'm on my tractor out there in two degrees winter trying to get the groaning starter and chilled battery to turn over the engine just fast enough to fire, I seriously think about what the next oil change will contain ...
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Ray54
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
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Posted: 27 Jan 2022 at 11:40am |
 bigbirdww wrote:
Thanks for the reply and I will try the 10-30. What would you use for the final drive. Cant find 145w. Thanks |
I would guess a gear oil , but only a guess.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 27 Jan 2022 at 12:23pm |
you can use 80w90 weight or 75w140 in the final drives... Some of the later tractors even started using the Universal Tractor Fluid....... but i prefer the Gear Lube.
if you have trouble finding 10w30 ( i dont), then 5w30 would be OK... The last number is the normal motor weight ( 30 wt)... The first number is the winter start number.. so similar to a5 or 10wt when cold .. easier starting than the old straight 20w or 30 w.
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Like them all, but love the "B"s.
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Stan R
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Joined: 03 Dec 2009
Location: MA
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Posted: 27 Jan 2022 at 4:48pm |
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When we converted our tractors from 30W to detergent 10W-30, we changed the oil and filter after about 20 hours of use, then again after 50 hours of use. Never saw any issues. Not sure if this is right or wrong, but made sense at the time.
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steve(ill)
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Posted: 27 Jan 2022 at 6:13pm |
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I agree with STAN.. Everything i own uses Detergent Oil... Change the oil NOW and monitor.. If it looks like crap after 20 or 50 hours then change it out.. Better to get any CRUD out of the motor as compared to let it set... I have NEVER had a problem converting an old motor to Detergent.
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Like them all, but love the "B"s.
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corbinstein
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Joined: 31 Jul 2014
Location: Oklahoma
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Posted: 28 Jan 2022 at 6:36am |
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Rotella 10W30 or 40 should have Zinc, which is sorta necessary I hear for flat tappet engines.
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bigbirdww
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Joined: 20 Aug 2021
Location: Ipswich MA
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Posted: 29 Jan 2022 at 1:13pm |
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Thank you for all of your responses. What a great site for wisdom. I did reach out to Lucas Oil for 145 W gear oil. I thought you might want to see their response.
Thank you for your interest in Lucas Oil Products. We do not offer a straight weight SAE 145 gear oil. We have two gear oils that are multi-weight, SAE 85w140 #10042 and SAE Synthetic 75w140 #10121. These two gear oil are an API GL-5 meaning the EP (Extreme Pressure) additive has a high concentrate of sulfur and phosphorus which can be corrosive to soft metals like brass, bronze and copper. These gear oils are designed for hypoid gear sets for vehicles. So I would say unfortunately we do offer a product for your application. Have a great day!
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1948 AC-C
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steve(ill)
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Location: illinois
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Posted: 29 Jan 2022 at 7:55pm |
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just go with the 80w90...
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Like them all, but love the "B"s.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8471
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Posted: 29 Jan 2022 at 8:49pm |
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It don't hurt to pay attention to the GL4-GL5 differences. I don't know if any thing in these old tractors has the bronze bushing to worry about(GL5)
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