I used to run Mobil1 fully synthetic, then I switched to Royal Purple 10w-30 for a year or two, and now I'm back to Mobil1 fully synthetic. Mobil1 always seemed to work the best for me, tried Royal Purple after reading all the comments on it here, found no change, good or bad, so I went back.

 

RP is all marketing, that's why it's so expensive, you're paying for a name. The limited tests I've seen show Amsoil/Mobil 1 to prevent more wear..

I run Mobil 1.

 

Valvoline SynPower 10W-30 Full Synthetic 5qt jug @ Walmart: $20
NAPA Gold 1515 filter: $6
=$26

^Thats what I use

 

same here

 

That should be fixed now guys. Sorry for the mix up.

 

regular ol Valvoline 10w-30

 

Switched to Mobil 1 at my last oil change, about 3 weeks ago. I have long used Royal Purple with no problems what so ever. But losing my sponsorship with them kinda forced the switch.

 

Rotella 15W-40 Dino Oil. Been using it for the last year now.

 

I run Mobil 1 10w-30 normally then when winter comes around switch to Mobil 1 5w-30.

 

I'm just curious, but what makes Mobil 1 so great. I mean, I keep on hearing that "it works great" but what about it makes it great. exactly how do you know its working. what exactly is it suppose to do and how do you measure it's effectiveness?