Originally Posted by LS Eater
This [Royal Purple] is the BEST oil out there! Better than Amsoil... I put it in all my vehicles. my 06' 6.0 GTO actually gained 11whp on the dyno with this alone! Just put it in the 09' Hemi Last night! my truck loves me now...
I've been running this oil in my 09' HEMI since first oil change (which is only one
) but during the first few minutes of warm up I hear a sort of light knocking noice from the engine. Anyone else?
I was thinking about switching to Mobile 1 (or even stock) oil next change to see if it stops.