Please see attached for UOA. The Castrol 0w40 Edge used in this was from 2017-2018 and still had the LL01 certification, commonly known as BC / GC here. One of my favorite oils up until it lost LL-01, but I still use it in other vehicles I own.
I don't understand why flash point on this car always drops compared to my other cars (BMW X1 DI-turbo, Subaru STI Port Injection turbo, BMW 550i NA V8)- this car does see the most high rpm runs but it also always gets fully warmed up (by driving not idling excessively on cold start), and rarely sees drives that are less than 10 miles. 95% of all drives reach operating temperature. A lot of high RPM wot runs and many many canyon run miles from living near the canyons in southern california. Flash point of 380-390f from UOA ranging from 1400-2400miles seems a bit low. The other cars UOA carrying much more miles, short tripping and frequent idling still had better flash points.
Blackstone mentioned fuel dilution (yet it says trace amounts only) so maybe this oil sheered down more than it normally does compared to my other cars partly because of the frequency of high rpms and/or WOT runs.
Nonetheless the oil seems to do a good job minus the flash point (relative to my other samples with more miles on 0w40)
Link to previous UOA https://bobistheoilguy.com/forums/threads/dealer-filled-bmw-0w20-ll14fe-in-m4-any-concern.323536/
I don't understand why flash point on this car always drops compared to my other cars (BMW X1 DI-turbo, Subaru STI Port Injection turbo, BMW 550i NA V8)- this car does see the most high rpm runs but it also always gets fully warmed up (by driving not idling excessively on cold start), and rarely sees drives that are less than 10 miles. 95% of all drives reach operating temperature. A lot of high RPM wot runs and many many canyon run miles from living near the canyons in southern california. Flash point of 380-390f from UOA ranging from 1400-2400miles seems a bit low. The other cars UOA carrying much more miles, short tripping and frequent idling still had better flash points.
Blackstone mentioned fuel dilution (yet it says trace amounts only) so maybe this oil sheered down more than it normally does compared to my other cars partly because of the frequency of high rpms and/or WOT runs.
Nonetheless the oil seems to do a good job minus the flash point (relative to my other samples with more miles on 0w40)
Link to previous UOA https://bobistheoilguy.com/forums/threads/dealer-filled-bmw-0w20-ll14fe-in-m4-any-concern.323536/
Attachments
Last edited: