Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil, 12-Quart Bottle (Pack of 12)

Its the best. Love Schaeffers oil

This stuff is the best on the market for a 6.0 Diesel. I’m crazy I have sat for hours reading forums about the most asked about ,debated and discussed topic……best oil for my 6.0 diesel. I’ve literally tried Shell non synthetic and full synthetic Ford OEM oil and a few others. This with with Archoil AR91000 along with some form of ZDDP additive is hands down the best lubricant package you could ever put in this F-250 6.0 diesel period. STOP SEARCHING AND WASTING YOUR TIME IVE DONE THAT FOR YOU ALREADY!! Just pull the trigger!! PS Use OEM oil filter ONLY and change fuel filters every other oil change!!!

Great oil I run it in my 2012 Silverado duramax. I had a whine noise from the oil pump and now the noise is gone, Ill keep using this product

All good

One thing to point out this OTR 10W-30 is (0711CK4-006S) - which is a Semi-Synthetic... The (9012) OTR 10W-30 - (09012CK4-006S) is the 100% Full Synthetic - similar to the formulation of their 9000 5W-40 Full synthetic... I did not realize this until now - I spent 30min looking over Schaeffers website & finally found 2 types of OTR 10W-30... Just wanted to point this out - so buyers who prefer a 100% Full Synthetic was not mislead...

Great product as always from Schaeffers

The best oil money can buy. I use it in my 1999 dodge cummins diesel

Love this oil. Great quality

I have been driving diesels for 30 plus years and 1.5 million miles. I believe that this oil and all Schaffers products are the best Ive used. Since using this oil Ive had two b series Cummins go over 700,000 miles without touching the engine other than to adjust the valves. I use Schaffers in the tranny and differentials as well with same no failures results. I always rebuild my auto trannys at 300,000, clutches wear out no matter what, and shop said the externals look almost new each time.

Quicker cold starts. Cooler rung temps during heavy hauling.