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

Use exclusively in my 2017 Ford 6.7 powerstroke. Great oil.

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.

I have used this oil in my 2007 6.0 ever since I changed my injectors. Having used Mobil 1, Rotella T4 & T6, Amsoil, and Royal Purple, I obviously have a preference for high quality synthetic oils. This is the best oil I have ever used. Also the most expensive. Zero stiction issues with this oil.

Best oil for Ford 6.7 Powerstroke, hands down.

Typically the oil in my diesel turns black shortly after a oil change. (this is normal) The Schrieffer oil is not doing that as quickly. Very happy with the oil. I will review it again at 4000 miles during the my next oil change.

Great oil, can go way longer now on oil changes. Saves money on maintance. And motor runs so smooth.

Best oil on the market it’s the only oil I’ve used in my medium and heavy duty trucks.

Very expensive,I am dissatisfied ,my motor is now louder than it was before, especially when cold.I just dont see me using and pay in extra in the future for this product

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

I use it for my 2005 6.0l powerstroke f350. Amazing product, the engine fires right up cold starts hot starts does not matter. My new go to for oil. I bit more money but I dont have to run a Lucas additive anymore.