best oil MOBILE 1?

[Hit Man X]

Remember thicker oils cause powerloss. I run 20W50 in my F-150 and can gain about 10-15hp by going back to 5W30 from what I understand. Like running onthe ground vs in a pool.

My old C5 ran 5W30 M1 factory and the WRX uses M1 5W30 too.

If I use dino oil, I do with Valvoline.

[S&S parts junkie]

I'm with the Hitman...

[protruk]

Thanks guys, I think I might go with M1 or Royal Purple 10W-30.

Which one is better??? I think royal purple is a bit more pricey than M1.

I could be wrong

[ONE04FX4]

i use royal purple engine oil-10W-30. i use royal purple differential oil. i use royal purple tranny fluid and i use purple ice coolant additive. damn now that's a lot o purple.

[01Thunder]

i swear by Royal Purple. but if you look at the price of how much 6 quarts cost and only change the oil every 6000 miles it adds up to be the same as changing it every 3000 with the cheaper oil. just my .02

[SilveradoSS03]

Just try the Royal Purple, and then let everyone know what you think. If you don't like it, switch. But I think once you try it-you'll stay with it!

[farmtruc]

I ran Mobile I in my 98 LS1 Z28 and have been running it in my truck for 2years now.
Like they say, just stick with one oil.

later,

allen