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

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?

Used it for years in my gm crate works great

I have a 2008 6.4 Powerstroke its some of the best oil that Ive ever used when I started using chafers Ive had the cleanest filters Ive had since Ive owned the truck I highly recommend this to anybody.

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

This oil company is the best in the biz!

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.

I tried this due to not being able to find Rottela T5 in the stores. For me this will be a permanent switch. My 6.0 starts easier runs quieter and seems to get a little better fuel milage.

Excellent quality oil. I use this in an old 3800 GM v6 and it works quite well. Although not fully synthetic, if you do your research, this is much better than even full synthetic Castrol. Pour point, viscosity index, and flashpoint are very impressive. Moly enhancement really works, probably better than Royal Purple which is another moly enhanced oil.

Theirs no better oil on the market

I can’t say enough about this Diesel engine oil. Best stuff on the market.