Quote:
Originally Posted by Anthony7515
i normally use motul oil but don't have that option tomorrow and need an oil change asap. I'm running the full blown turbo kit stage 1 premium on e85. which oil is better mobil 1 or royal purple. please help!
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"Which oil is better" is not something that anyone here can prove. Both companies offer many different oils and I would be looking at the best oil choice for your particular application when trying to make a decision.
For a boosted car running E85, I would not use the 0W-20 GF-5 oil from Mobil 1 or Royal Purple or any brand. I would be looking at something a little robust and with higher detergency/dispersancy levels. For Mobil1, maybe the 0W-40 since it's a light 40 grade or even the High Mileage line since it has the older API SL levels of anti-wear additives. For Royal Purple, probably the High Performance Street oil in 5W-30.
UOA's here have shown that with a
very good tune you
can run GF-5 0W-20 oils with good results, but there isn't anything wrong with maybe stepping up the viscosity and/or or the anti-wear/detergent package. And I definitely wouldn't make a decision based on how someone
feels about brand x over brand y. Sure, RP offers low bang for the buck, but that doesn't mean it sucks and they do have a nice variety of oils to choose from (GF-5, high performance street, and pure racing).