




🛢️ Drive with confidence—engineered to outlast and outperform every mile.
Schaeffer Manufacturing's SynShield Durability Advantage 15W-40 is a premium synthetic blend diesel engine oil designed for heavy-duty use. It delivers exceptional wear protection, oxidation resistance, and soot control, enhanced by proprietary friction modifiers Micron Moly and Penetro. Suitable for modern emission-compliant engines, this oil maintains viscosity stability and extends engine life even under severe operating conditions.







| ASIN | B06VVXGSM7 |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #7,412 in Automotive ( See Top 100 in Automotive ) #105 in Motor Oils |
| Brand | Schaeffer Manufacturing Co |
| Date First Available | February 14, 2017 |
| Global Trade Identification Number | 00744954027538 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 7.54 pounds |
| Item model number | 0700CK4-006S |
| Manufacturer | Schaeffer Manufacturing Co. |
| Package Dimensions | 10.94 x 7.6 x 4.13 inches |
| SAE J300 Viscosity Grade | 15W-40 |
| Size | 1 Gallon |
| UPC | 744954027538 |
| Vehicle Service Type | Car, Truck |
| Viscosity | 15w-40 |
D**.
Engine runs so smooth with this oil
Run this product in my 2001 Ford power stroke with a 7.3l , 220 on the clock and it started to run not as smooth as it use to . Understandable with the miles. Frend of mine ask me if I would try it. I said yeah sure until I seen the difference in price. So I was like ahhh no that's ok ...he laughed and said I have a couple of gallons, try it for free and if you don't like how smooth your engine will run then you don't have to pay me for the oil ...I said ok I'll do that. All I can say is that it is well worth the price . I was amazed at how much smoother and cleaner sounding my engine was running if that makes sense. Idles so smooth and starts easier. Been in my truck for about 2000 miles now and I swear it keeps getting better the more I drive it . The turbo even sounds better , definitely recommend running on an older diesel engine. Not sure about newer diesels because I don't own one but I'm sure it can only be a great product for new engines as well
E**N
Excellent quality product.
Owning a Diesel engine, and researching toxic of oil for the engine, I settled on this product. The “oil geek” YT channel teachings, Is one venues of wisdom I use on ail related concerns. This has a cleanser trait most others oils do NOT. It's one of the better products HGH quality for our Diesel engines. I HIGHLY suggest change your Diesel engine oils & filter, 4K Miles. It's expensive yet the thing will last 500K miles or MORE, if you maintain it right. Diesel engines create SOOT and so the manuals say 10K miles, NO FLIPPIN way!! 4K Miles MAX. Unless you put in an oil bypass filter setup. Then double it. All example I seen of diesels lasting 500K-900K Miles were #1 secret, Change oil / filter Ofter!!!!
R**C
The best!
Best oil hands down for my 6.7 power stroke
J**K
Excellent oil my 25 year old truck improved mpg
My 25 year-old 7.3 L turbo diesel picked up 3 1/2 miles per gallon increase engine noise decreased couldn’t be happier with it
A**T
Oil
This oil gives me the best fuel mileage ever and it’s valuable for my diesel engine. Great buy!
A**R
Awesome oil
Best diesel oil ever.
D**D
Good oil
I only use this in my Cummins. Kinda expensive but you get what you pay for. My truck seems to run better and sounds better
R**R
If you know you know
Its Schaefer’s need a say more, if you know you know and you buy it for the rights vehicles. Two of mine run this stuff and they love it. 7.3L and TDI 1.9L
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