One more FM question, Please

[FrankN4]

"IF" an oil film never ruptured or became to thin, then FM would never come into play. If it did, then FM would give a first line, sort of a near miss defense and ZDDP would be the REAL defense.

Lets say I have two 5w30 synthetic oils, both believed to be G IV. Both are near identical in 40C, 100C cSt, TBN, Noack, and pour point. However, one has a HTHS of 3.2, ZDDP of 840, and a heavy FM package. The othere has a HTHS of 3.5, ZDDP of 1340, and no FM. What kind of, if any, wear differences should I expect between these two oils extended out to 100,000 miles and beyond? Does anyone know when FM were first used in oils?

 

[Tempest]

I suspect that the wear would be related to usage and time of OCI. Hard driven engines will need higher levels of AW to cope with extreme conditions such as heat which will thin the oil. The type of ZDDP or other AW adds also matters.

I think you might see slightly lower wear levels in otherwise identical oils with FM but I bet the difference would be very low.

HTHS is overrated in daily driver applications but if hard driven, then it would apply more.

All of the above is strictly my opinion and no I don't have anything to back it up!