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Old 03-07-2008, 04:35 PM   #5
Scooby Guru
Member#: 767
Join Date: Jan 2000
Chapter/Region: Tri-State
Location: N.J.
04 FXT


Do a search in this forum with Royal Purple and the Redline in the subject line and you will find 256,590,875 posts.

RP xw30's have a tendency to shear. I would use RP 5w40 in a tuned WRX in So. California, or Redline 10w30 or 5W40. Do a used oil analysis to determine the appropriate oil change interval. Doing a search with "Redline" should show you a result of a recent uoa on RL 5W40.

RP is API certified and RL is not. However, do you have a powertrain warranty anyway?

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Last edited by bluesubie; 03-07-2008 at 04:43 PM.
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