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				Originally posted by V8killimports  
Umm.. yea I am pretty sure you won't get and performence gains at all from synthetic.. just more protection for your engine....and choosing a weight oil can depend on a number of things.. if your oil pressure is a little low maybe cause its hot as hell outside, it's cause it's thinned... use a heavier weight.. if it's winter use a lighter weight.. 
			
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I think he mentions the performance part because of Royal Purple's claims on HP gains.
 
It may be good oil, but I hardly believe the hype on any gains.  Lots of things can affect that dyno to get a few extra hp.
Mobil1 Syn & Purolator PureONE filter is still the best bang for the buck....
