I found a great link to test results for over 50 oils. I take no credit for any info just wanted to pass along. Ive been running rotella t6 in virtually all my vehicles and these results aren't very favorable. SEEMS PENNZOIL ultra 5-30w had the best results, but im wary to try such a thin oil in our engines.

Diesel Oil

 

Good find and interesting analysis. I too am using Rotella and happy that you shared this. These oils are now of interest.

and


Valvoline VR1 Synthetic Racing Oil, API SL (black bottle)
10W-30
20W-50


Valvoline VR1 Conventional Racing Oil (silver bottle)
10W-30
20W-50

Pennzoil Ultra
5W-20
5W-30
10W-30
5W-40

Can our cars run fine on 5-40 or is 10-30 preferable?

How important are moly levels? Is this what moly is in reference to? Moly Basics - Bob is the Oil Guy

Once again thanks for sharing.

 

yes our cars can run 5-40 .

 

Good to see some actual #'s for various oils and my good old castrol 20/50 is still a good choice and I will keep running it.

 

There was a special on 5-50 casctrol edge .. and I'm honestly in love with the stuff . car

idles somuch better when cold or hot . oil pressure is great all over

 

How often are you guys changing your oil with synthetics? Castrol edge is synthetic, right?

 

3k miles .at most . I get synthetic for the fact that they have thin cold weights , and thick hot weights like 5-50 0-40 , Not for its long lasting abilities .

you have to change oil often in a rotary one of the main reasons is blowback , your oil gets contaminated with fuel and becomes less and less of a lubricant .


This is why most people dont bother with synthetics . why pay twice when you still have to change the oil same intervals .

--> FerrariChat.com - FAQ: Motor Oil Articles by Dr. Ali E. Haas (AEHaas) <--- this is my reason. I read this years ago, and it gave me an understanding on oil that Was pretty enlightening