Quote:
Originally Posted by ZX-10R
That's not the reason - if baffling isn't adequate for 0W-40 it won't be adequate for 15W-40 either. Factory fill on the GT3 is 0W-40, I rest my case
15w-50 is way too thick (reminds me of BMWs bonehead call for 10W-60 and the many E9x M3 bearing failures that resulted). They are trying to anticipate viscosity loss for track use but most people change their oil every track event anyway.
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BMW E46 M3 bearing failures had nothing to do with the 10w60 viscosity, it was the bearing design/spec. I had my M3 bearings replaced 2x under preventative factory recall work but they never had an issue prior to this work. If it was the oil they would have changed the spec, it is still 10w60 today and E46 M3 is one of the best performing "old" cars at the track. Owners of these 20 year old cars with high miles hammer them on hot days at Buttonwillow and Auto Club Speedway and smoke high HP cars all day. If you get your bearings replaced with the new design as indicated by by BMW and run the 10w60, you're good to go for hard use.
Our 15w50 is not too thick for the track, at 250 F+ temps I'm glad it's in there and wouldn't use anything else. Porsche is a different design, requiring a different oil.