Quote:
Originally Posted by DarkSunrise
Nice, thanks for the data point. That UOA does look very solid. Out of curiosity, how many track days had the engine seen at that point?
I think the only thing that concerns me about PUP 5w30 is its KV 100 value is lower than most other 30 weight oils I've looked at:
PUP 5w30: 10.3
Castrol Edge 5w30 EP: 10.8 (2.9 HTHS)
M1 5w30: 11.1
M1 0w30 AFE: 11.5
Castrol Edge 5w30 LL: 11.6 (3.5 HTHS)
Pennzoil Euro L 5w30: 12.6 (3.5 HTHS)
I'd bet any quality synthetic 30 weight oil would be fine though. BTW I get the sense that Subaru is much more likely to void the warranty for track use than for using a 30 weight oil.
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I also use PUP as after a ton of research and calculations, I determined this to be the best bang for the buck with great specs. One thing I wanted to note which I'm sure you understand - that lower KV value is so insignificant, it really doesn't matter. The difference between 10.3 and 12.6 even out of the list you gave is completely insignificant. It's not a 19% difference in flow, it's just a difference in 2.3 cSt which is practically meaningless. Don't forget, when you start your car in freezing temps, you're sitting in the 500-1000 cSt range. Now THAT's a difference.
But I do have to admit if you're tracking or reaching very high temps often, I can see why the absolute lowest KV100 value (out of your list) will be unfavorable.