Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil, 12-Quart Bottle (Pack of 12)
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D. Davies
> 3 dayUse exclusively in my 2017 Ford 6.7 powerstroke. Great oil.
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Kostas
> 3 dayWould give this 10 stars if I could. Oil makes my Cummins a lot more quiter. Doesnt shiver like a chiwawa anymore and oil change intervals now at 7k miles.
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Fafafohi
> 3 daybest unknown secret oil out there, oldest oil company in the USA.
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Michael Craig
> 3 dayTravel between Texas and Wisconsin several times a year. This oil has out performed all others hands down. My 2013 F-350 is a happy machine. Mileage Increased also by a mile per gallon.
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dusti gorby
> 3 dayFor Hubbys stuff..
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Robert C.
> 3 dayGreat 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
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Bob R.
Greater than one weekIts the best. Love Schaeffers oil
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Jeremy R.
02-06-2025I 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.
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Adam Lawrence
> 3 dayTheirs no better oil on the market
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joe carney
> 3 dayGreat oil
