Quote:
Originally Posted by ddeflyer
I would add that you should get a used oil analysis too. When the oil costs $100 a change the $25 that black stone charges can be worth alot. Also it can let you know if you have something unusual happening in the engine before it grenades.
I was changing more frequently than I needed to, UOA is saying 8-10 track days and 5K miles on my car with 300V 0w20 (and of course that is going to be different for different people! don't assume your oil will last the same as mine).
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Sorry for the slight off topic here.
I've been struggling with the validity of data from a UOA for the track. As I understand the process, they measure for wear metals and the current viscosity. I don't believe they address viscosity at high temps. So, while a really bad number can be a sign of wear, it's probably too late at that point and a "good" wear report may not be indicative of degraded high-temp viscosity, which is what we care about.
Personally I'd rather change the oil more frequently, a change only costs me ~$60, for the peace of mind.