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

Best oil on the market! Definitely quiets the engine valve train down and runs smoother. I’ll for sure purchase again!!

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.

Its green

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

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.

I run this in my 2015 F250 6.7. They actually sent the correct oil this time. Change oil and filter every 5k miles.

Its the best. Love Schaeffers oil

Im running this in my 17 F250 6.7, all previous oil changes were T6. Schaeffers is supposed to be far more premium but honestly I think the Ford 6.7 runs better on Rotella. It seems to run louder on Schaeffers and this oil meets Fords specs. I bought Schaeffers because it was on sale here on Amazon for $6 a gallon less then T6, and because I was intrigued to try it. I also noticed that I get a hair better fuel economy with Rotella but its so small maybe its not worth mentioning. Im going to give Schaeffers a little more time since I bought enough for 3 oil changes, but Im feeling in my gut T6 will probably be the winner after Ive gone through all the Schaeffers.

Noticed mpg improvement. Cant beat moly.

I’ve been running Rotella in my personal and fleet trucks for quite some time now. Just got delivery of my new Ram 3500 limited(comes from factory with T5 rotella)…or so I’m told. Fast forward 2 weeks I put 2k miles on her and that’s right around the time I do my first oil change on all my diesels. I decided to grab this stuff on a recommendation from a good friend, didn’t expect nothin much of it as a difference from rotella. Boy oh boy was I wrong. Right after driving off from said oil change I could easily feel and hear the engine performing differently in a good way obviously, fast forward a few days and I went from 13.4 mpg to almost 16. Did not change a dam thing other than oil. Still driving the same if not faster. From now on all my trucks are running this oil.