Best oil to run.
 

I recently swapped from Castrol 10w40 to Royal Purple 10w40 HPE. After about 1100 miles it looks dark and broke down. I see on the LS sight allot of the guys are running the Shell Rotello 5w50 with good results. What do you guys think about running this oil in a LS? I know it has more Zinc than most oils but what about the weight?

Looking at oil with the naked eye doesn't tell much of anything. If you really want to know, get it analyzed.

Unless there's a problem with the engine, the RP you're running is fine. Rotella would be a downgrade.

Read this: Puts all the zddp bs to rest.

ZDDP: http://speedtalk.com/forum/viewtopic.php?f=1&t=31791

Diesel oil: http://speedtalk.com/forum/viewtopic.php?f=1&t=32279

If you really want to know what the oil like after use you should do an oil sample. If you are really concerned you can do a sample of a brand new bottle of oil then do a couple used samples so you get a baseline and that should help determine if you need to switch oil or if it is in fact still good to go.

We use fabco / cat oil sample kits as they only cost $12 and that includes the postage.

As far as oil goes we use at my work off road oil mainly marketed for farm tractor use. With 7000 miles on my duramax our oil rep said the #'s on the sample would have to triple before he would even start to worry so this oil change is scheduled for 10k miles and I will recheck then to see where we are at.

The oil we use is called Central Petroleum Company (CenPeCo), I have personally looked at the bearings on a 200k mile lumina 3.1l engine that looked like they were just installed they looked that great.

If you would like lots of info I can give you our oil reps # and he will talk your ear off :D he knows his product and has proof through oil samples that it works!

Good luck and send me an email if you want to talk more :)

Thanks for the info guys.

I wouldn't put RP in any engine I care about.

Thats the problem if you ask 20 people you will get 20 different answers. I had one guy tell be he wouldn't use RP on his door hinge. LOL
I think I am going to pull a sample and have it checked where I work at.

amsoil.

When someone says they wouldn't use it, for the benefit of others, stating "why" would help.

Engineering analysis is the only sure way to separate marketing from chemistry.

Redline :D

PS - I'm lucky at Liar's poker. :unibrow:

I run RedLine in everything