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Schaeffer Manufacturing Co. 9000CK4-012S SynShield OTR Plus Full Synthetic Diesel Engine Oil 5W-40 is a high-performance engine oil designed to enhance fuel economy while ensuring maximum engine durability. With superior cold weather startability, exceptional heat resistance, and advanced soot-busting capabilities, this oil is engineered for the modern professional who demands reliability and efficiency.
| Manufacturer | Schaeffer Manufacturing Co. |
| Brand | Schaeffer Manufacturing |
| Item Weight | 1.79 pounds |
| Package Dimensions | 8.86 x 3.98 x 2.32 inches |
| Item model number | 9000CK4-012S |
| Manufacturer Part Number | 9000CK4-012S |
| Viscosity | 5w-40 |
B**A
Quality oil
Use in my F-250 PSD, never an oil related issue with my old 6.0!
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.
P**T
Schaeffers full synthetic top tier oil
This is a top tier synthetic oil. I highly recommend it!
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
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
2 months ago
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