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⚙️ Drive smarter, last longer — the diesel oil pros swear by!
Schaeffer SynShield OTR Plus 5W-40 is a full synthetic diesel engine oil engineered for heavy-duty trucks, delivering exceptional wear protection, fuel economy, and cold-weather performance. Featuring proprietary friction modifiers and superior soot control, it meets API CK-4 specs and supports modern emission systems, ensuring your diesel engine runs cleaner and stronger mile after mile.
| ASIN | B08BVVVSRL |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #122,311 in Automotive ( See Top 100 in Automotive ) #722 in Motor Oils |
| Brand | Schaeffer Manufacturing Co |
| Date First Available | June 25, 2020 |
| Item Weight | 1.79 pounds |
| Item model number | 9000CK4-012S |
| Manufacturer | Schaeffer Manufacturing Co. |
| Package Dimensions | 8.86 x 3.98 x 2.32 inches |
| SAE J300 Viscosity Grade | 5W-40 |
| Size | 1 Quart |
| UPC | 744954027675 |
| Vehicle Service Type | Truck, Diesel Engine |
| Viscosity | 5w-40 |
N**K
The best!
Great oil currently running in a 2012 f350 6.7 diesel oil always looks good after 5,000 intervals
C**.
Best oil for a diesel!!!!
I run the 5w40 in my 2019 ford f350 with the 6.7 powerstroke. Changed the oil fired it up let it run shut it off and checked oil. That oil was still clear!!! Even after 3000 miles it looks better than rotella t6. Highly recommend and only oil to run
J**C
The best diesel oil on the market
I've run lots of the big-name diesel oils and run lab samples every other oil change. This oil simply the best and the lab results prove it.
B**A
Quality oil
Use in my F-250 PSD, never an oil related issue with my old 6.0!
P**T
Schaeffers full synthetic top tier oil
This is a top tier synthetic oil. I highly recommend it!
R**.
75k over 10 years in STI, still using Schaeffer without fault
The car has seen 75k in the last decade, with Schaeffer full synthetic. Years ago was the suggested oil by enthusiasts in Denver. I moved away and continued to use Schaeffer products. I've had Blackstone test the oil multiple times, results are consistent. The new formulation seems to be okay, the car is happy as ever. STI's notoriously are bad with oil consumption, I can't say I've had excessive consumption issues yet. Expensive oil, and absolutely worth it.
Trustpilot
4 days ago
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