Mobil 1 Question in Excellence. Do not pass 3K miles

[sgt brad]

Originally Posted by JFP in PA

I would not bet on that. Along with dropping ZDDP levels, M1 products have shown a drop in film strength, particularly in the 0W-40 oil. And, in general, any given oil’s film strength decreases with miles, particularly under either high heat or shear conditions, which the car in question was obviously seeing. Higher cold weights (5W or 10W as opposed to 0W) oils from a given manufacturer also tend to demonstrate higher film strength as well. That is also why they suggested the Motul product in a higher weight, which is a Group V oil with both higher ZDDP (1200-1300 ppm) and superior film strength when compared to M1.

Do you still find cast roll edge with syntec acceptable?

[Flavor 987S]

Originally Posted by BYprodriver

Same here, I read enough to learn basic guidelines & trust JFPinPA recommendation.
When Jake Raby endorsed Joe Gibbs DT40 & it became available I switched to it.

Originally Posted by Chuck W.

I plan on using Joe Gibbs DT40 when Jake Raby releases the new formula. In September 2012 he stated, "We still have to burn through another 750 gallons of the current DT40 before running the next batch.The new flavor is already developed, but currently a 5 gallon pail of it cost almost 1600 bucks!.

IMHO, Mr. Raby has a passion for his business and has a good handle on what our engines need. Evidently, there was an issue with the first generation oil causing noise on start up.

I switched to the 5W40 Joe Gibbs DT40 in the fall prior to winter hibernation. Can't wait to see my next Blackstone UOA. And I recently bought a second case (12 quart bottle case) when L&N had a black Friday sale. Saved about 30%.

[JFP in PA]

Originally Posted by sgt brad

Do you still find cast roll edge with syntec acceptable?

Yes, it remains our baseline oil. We recently have begun testing three other candidates, but the data on them is currently limited.