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I use k&n filters and royal purple. Ive never really had a problem with rp other than the pressure dropping when the engine is really hot. This seems pretty consistent with the claims on that PLSX thread of rp thinning out after about 2k miles...maybe its time for a change
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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