Originally Posted by merlinmol
Since I got the track pack, Ford puts in 5w-50. I used that for break in miles, but I had RP 5w-30 XPR for SEMA and recent track sessions. I just did the 2nd oil change a few weeks ago and went to RP 5w-30 HPS, the XPR is a little too rich for my blood and I don't consistantly race.
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From what I've read the 5w-50 was just to cover all vehicles across the nation in all climates under harder driving conditions. I run the same RP HPS, what made you switch?
Originally Posted by Toby
I would not do that.. 3k, 4k TOPS is all that I will recommend regardless of the type or brand.
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I change at 5k right now but this is part of why I'll be sending in oil samples to be tested, I'd like to see what's left in the oil. RP and AMSOIL are confident in getting 10k between changes under "normal" driving conditions.