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Your cart is empty.Schaeffer's SynShield Durability Advantage 15w40 Oil is a premium advanced performance, synthetic plus, heavy-duty diesel engine oil formulated to provide maximum protection against wear, oxidation, deposit formation, soot contamination and aeration. SynShield Durability Advantage 15w40 provides excellent equipment durability and longevity even during harsh, extreme duty operating conditions. Using Schaeffer’s proprietary friction modifiers, Micron Moly and Penetro, SynShield Durability Advantage 15w40 creates a slippery, tenacious shield that prevents metal-to-metal contact. This added layer of durability protection significantly reduces wear on bearings, rings, pistons, cylinders and valve trains. SynShield Durability Advantage 15w40 Engine Oil is suitable for use in 2007 and 2010 emission complaint engines that utilize heavy exhaust gas recirculation (EGR) and exhaust after-treatment devices such as diesel particulate filters (DPFs) with or without diesel oxidation catalysts (DOCs) and selective catalytic reduction (SCR). Schaeffer's 15w40 diesel oil meets and exceeds API CK-4 specifications.
D Mani
Reviewed in the United States on February 7, 2025
One of the top oil of choice for my diesel trucks.
Mike
Reviewed in the United States on February 5, 2025
Best tastin oil out there
Park A
Reviewed in the United States on February 23, 2025
Best diesel oil I’ve ever found. 6.0L powerstroke still running strong at 270k.
Joseph C
Reviewed in the United States on February 2, 2025
She oil does a great job with oil quality and fair pricing for a high performance oriented oil. This oil helps out significantly on my street car that has a junkyard engine in it since running this oil my engine has stayed nice and quiet, and even while changing the oil at shorter increments for this particular vehicle, it is still quite affordable.
Buck Jr.
Reviewed in the United States on January 3, 2025
I stand by the product with several cars! Once you have the car, change the oil & replace with this product - first oil change! Your engine will hum, run very smooth & crank smoothly (even in the harshest weather) Excellent value for the price and you can run an extra 1k miles before changing oil with this product.
Bill
Reviewed in the United States on January 18, 2025
Product was perfect!!!!
Jeff
Reviewed in the United States on November 10, 2024
I’ve ran royal purple 15x40 in my 2007 6.0 powerstroke for the last 5 years and was told it’s one of best oils on the market and every so often I noticed I’d have a long start well a couple oil changes ago I couldn’t get any so I tried Schaffers 15x40 and will never use anything else. Engine seems to run smoother and I haven’t had a long start since the first time I used it, maybe it’s just my setup but I’m a believer I would definitely recommend.
Luke P.
Reviewed in the United States on October 10, 2024
I use this on my backhoe and tractor, after about 2-3 hours of run time on my backhoe after the first time using, immediately improved the overall sound and feel of the motor. Also took the top end off for another issue after a couple of changes, clean as could be, all the internals looked top notch. It does cost more than other brands but I will say I’m pretty confident this is tailored for heavy equipment.
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