Vehicle Oil Change Interval ??

This is on an '05 5.4 Ford with conventional oil/Motorcraft 820S filter. Can I "stretch" the 3000 mile interval if I've got to add a quart and a half between (I've stretched it to 3500 miles since I've owned it) oil changes to 4,000 miles ? Thanks

Edited by FREEDGUY - 05 Feb 2021 at 5:55pm

Thanks for the reply, seems like the 5000 was for synthetic  .

Thanks guys

Light comes on at 3,000 so I go two lights worth...

In my '99 5.4 I run the Motorcraft synthetic blend and change at 5,000 mile intervals; 242K on the clock now. A lot of the service centers still add 3,000 to the odometer reading and it gets them more business.

02 Chevy 6.0 synthetic blend every 3-4K

I had access years ago to oil sample analysis so used it, My '99 F250 7.3 diesel ended up at 5k intervals Religiously to when slowed usage became twice a year REGARDLESS spring and fall.  Oil looked great as drained as may have only had 1800-3000 miles but acids build up and filtration does NOT remove or stabilize.  Moisture buildup from sitting is the WORST for production of acidity on oils.  My later autos have a built in miles against driving aspect calculators, our Exploder runs on average 4800 miles between as get to 30% remainder oil life, my Pimpala goes closer to 5500.  Tractors are still generally twice per year both the last 7G and the 180 as well the little Deere Diesel mower.

The thing to look for when going over on oil changes intervals is how thin the oil actually gets - the manufactures have there specs along with oil, everyone bitches when the auto transmisions go out, but  because no one pays attention to the manufacture specs on oil changes,,  just my experince

Edited by DougG - 06 Feb 2021 at 12:15pm

Nephews mother in law had an early 90’s? Bonneville. They stopped changing oil at 180k, hood seized at 240k so no fluids added or checked and drove til about 340k. (All miles)
I change diesel 7.3 trucks at 5k or spring and fall if not enough miles.
180 and 185’s annually, not regular use anymore.

fixer1958 wrote: 02 Chevy 6.0 synthetic blend every 3-4K

I change both my T/C's at 3,ooo M. My son who is an ace mechanic recommends the 3,000 m, intervals and use the oil that is is recommended by the car company. And the better oil filter you use is very important.       Leon

Thanks for the reply Stan, makes sense on the multiple vehicle oil changes .

Leon, ask your son about the Toyota program.  Our Highlander is changed at the 10K or one year interval, and that is with a lifetime power train warranty. 

my tractors had oil and filter changes every 100 hours, my vehicles get both changed every 2000 miles.