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

Excellent oil, I used this in my 2015 f250 diesel, and the engine oil runs 8 degrees cooler than it did before. First time I actually seen a difference in an oil like this, really lived up to its name ,will buy it again.

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

We use this oil exclusively with our Diesel Trucks because its good quality but for some reason I cant get Amazon to deliver it anymore. They keep giving me the excuse its undeliverable each time. So I guess I will have to get my product elsewhere.

Top of the line oil no doubt but, it’s advertised as 5 gallons but only contained 4.5 gallons. Where are the other 2qts I paid for?

2008 ford 350 6.4

Fantastic oil but one of the quarts leaked a couple ounces during transit.

The best oil money can buy!!

Quicker cold starts. Cooler rung temps during heavy hauling.

I love the oil but am very disappointed in the condition it was received.

So, I started using this product in my fleet since the Supreme 9000 5W-40 CJ-4 is not recommended for newer EGR/SCR equipped vehicles. Two things Ive noticed: 1. The oil stays cleaner much longer 2. The buses use much less DEF. Because this is made by Schaeffers, I trust that the durability will hold up and keep my equipment running for many miles.