Originally Posted By: Scout1
I donno... I keep getting disappointed since becoming OCD about oil! I expect such great differences but it all works pretty well! My Honda has had GTX 5w20 and 5w30 and I can't tell the difference. I've tried PP 5w30 and it felt a little peppier and got a bit better gas mileage.
My Audi TT has had Synpower 5w40 and now RTS 5w40 and it likes the Rotella better. Same with the Rotella in my FJR bike. Rotella seems to live up to the hype.
Now, going forward, I'm planning to try GC, I have some M1 0w40, got a load of MaxLife 10w30 in the wife's van (can't tell a bit of difference), I've even got a couple of changes of straight 30wt to try this summer (Valvoline and Chevron), oh yeah there was that M1 15w50 I found on sale, and the M1 Turbo Diesel truck oil, the GTX Start up, QS Synthetic in the Ranger.... did I say I was a little OCD about oil?
You're not the only one, I haven't noticed any difference between Havoline, Valvoline or Amsoil 5W30's in my car. They all felt, started and performed exactly the same to me.