Extended interval oils

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The whole thing. I have friends that do 15K with M1 EP oils. Another does 15-20K with reg M1 5-30. All their engines run very well even at 350K. Myself, I do 10K OCIs and have for 40 years.
 
I believe the running/usage pattern, typical environment in which the vehicle runs it matters as well, then fuel delivery system, having a UOA done to verify the oil can be run for a longer interval and then the type of oil dictates if an oil can be run for 15k miles.

Dnewton3 ran Rural Farm conventional oil for a bit over 13k miles in his motor. Typical running pattern, fuel delivery system, and environment his vehicle ran in, and having a UOA let him know he could run it for a long interval has well.
 
Definitely the base oil. For example when you look at Mobil 1 EP and Mobil 1 AP oils you don't see much difference in the add packs.
 
You will want a spun microglass filter on that 25k mile interval, maybe a tbn booster the last 5k miles as well, ha.
 
Originally Posted By: Jetstreamz06
Is there any benifit to running this type oil in an air cooled, small engine?


Probably. Synthetics hold up better under high heat than dino oil does, so there should be some benefits. As always, utilize a UOA to decide on the correct interval for your particular engine.
 
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