I've been using Amsoil for the past couple of years. Would have liked to see them test that also. When Royal Purple is on sale locally at a decent price, I'll feel better about substituting it now.

 

Shell Rotella T Synthetic 5w-50 one quart, then the rest Shell Rotella T non-synthetic 5w-40 (Gallon jugs at Walmart or Advance Auto Parts).

The EPA caused the oil companies to stop putting ZDDP in automotive oils this year but they still have it in diesel oils. I wouldn't run a standard engine without it, much less a performance engine. General Motors has tech bulletins out that say don't break-in an engine without a ZDDP additive anymore. GM has E.O.S. (Engine Oil Supplement) available at the parts counter for this reason. Chock full of ZDDP!

I run Rotella in everything but the Evinrude, and have done so for eight years. There are several other good reason's why.
All About Motor Oil
Very good info there, including why they can call dino oil synthetic in many cases and get away with it.

 

Royal purple, just cause purple and yellow go together. LOL

 

I use whatever Fully Synthetic oil I can happen to afford at the time. Typically Valvoline, never Mobil 1.

10w-40 in the summer, 5w-30 in the winter.

 

I've been curious about that Greddy oil, since I saw an ad for it a while back. Anyone use that?

 

Wow, After actually reading the PDF looks like i made a good choice....


However I usually pick up the Full Synthetic, not the DuraBlend

 

lots of GIII garbage oil in here.


ray_sir_six sells that ****. I know nothing about it.

bob is the oil guy > *

 

Mobil 1 in the Subaru and Miata, and their Bike version in my R6

 

I noticed two things about the Royal Purple oil. One, the oil in the test was the older API standard which has more of the zinc and phosphorus (ZDDP) that are your last-ditch extreme pressure lubricants when you go metal to metal. Royal purple is available in both the SL and SM ratings. The older ratings offer more protection.

Royal Purple has break-in oil that has extra zinc and phosphorus added. Royal Purple Engine Break-In Oil

 

valvoline never did mobile1 and am not looking forward to trying.

 

M1 5-40, mostly because it's free

 

This website is listed in the "stuff" section of the "Every Website You'll Ever Need" sticky:
Bob Is The Oil Guy
Get into their forums and start reading.

 

Shell Rotella T Synthetic 5w-50.

 

Well I'm a little bias because i'm an Amsoil dealer, but i use to run Redline until i found Amsoil and now that's all I run. I may be able to give discounts to members interested if there is enough people that would run it. PM me if you are interested and ill see what we can work out.

 

I already pay MY $20 a year. Know of any recent comparisons?

 

Mobil 1 10w30.

Vash-

 

Whatever the cheapest full synthetic is at the time. Really considering looking at Rotella though. Stuff so highly regarded in commercial diesels sounds like a good idea to me.

 

Mobil 1 Full synthetic 0W40 because Paul told me to.

 

I currently use Royal Purple 10W30,but I will be switching that over to Mobil1 or Redline real quick,heard & read about too many cases where Royal purple fucked up peoples turbos.

 

Alot of motorcycle racers use it as well.



Though if I was ballin' like hustler it would be only Motul 300v.