Diesel Oil Recommendation
- Thread starter ICG54
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I mention 15w-40 products in this thread but you can use 10w-30, 5w-40, or 15w-40 that meets Ford F1 Specification. Recommend higher grade than 10w-30 if towing heavy though. Nice truck!
Here's an AI overview:
When referring to a "Ford CK-4 6.7 Powerstroke," it means a Ford 6.7L Powerstroke diesel engine in a Super Duty truck that requires an oil meeting the API CK-4 standard, which is the recommended oil type for modern diesel engines, but Ford specifically advises against using standard CK-4 oils in their 6.7 Powerstroke engines and instead recommends their own formulated oil meeting the WSS-M2C171-F1 specification for optimal protection and performance; essentially, while CK-4 is technically suitable, Ford prefers their own blend for their diesel engines.
When referring to a "Ford CK-4 6.7 Powerstroke," it means a Ford 6.7L Powerstroke diesel engine in a Super Duty truck that requires an oil meeting the API CK-4 standard, which is the recommended oil type for modern diesel engines, but Ford specifically advises against using standard CK-4 oils in their 6.7 Powerstroke engines and instead recommends their own formulated oil meeting the WSS-M2C171-F1 specification for optimal protection and performance; essentially, while CK-4 is technically suitable, Ford prefers their own blend for their diesel engines.
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Great info, thank you sir!I mention 15w-40 products in this thread but you can use 10w-30, 5w-40, or 15w-40 that meets Ford F1 Specification. Recommend higher grade than 10w-30 if towing heavy though. Nice truck!
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- Nov 17, 2024
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So what is the Ford preferred oil and weight for this?
From the HotShot's Secret website:
Use motor oil meeting Ford Specification WSS-M2C171-F1. The manufacturer recommends 10W-30 for normal usage and 5W-40 for severe operations. If biodiesel fuel (B20 max) is used the use of 5W-40 or 15W-40 oil is recommended.
Any Xw40 HDEO off the shelf that meets Ford’s spec given your climate you’ll be driving in and is changed regularly will work fine.
I used some of the mentioned oils in this thread but ended up settling on Amsoil 15w40 Signature Series.
It runs way quieter and smoother in my 160k mi swapped Duramax - probably because it's higher viscosity and beefy add pack compared to the others.
It runs way quieter and smoother in my 160k mi swapped Duramax - probably because it's higher viscosity and beefy add pack compared to the others.
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I used T6 15w40 recently in our 5.9
I would use 5w40 full syn. There was speculation by some engine (re)builders that 15w-40 contributed to spun bearings in the earlier scorpion motors with tighter crank journal clearances.
The Delo 5w-40 doesn't meet F1, so I'd be looking hard at T6 or Delvac Extreme.
The Delo 5w-40 doesn't meet F1, so I'd be looking hard at T6 or Delvac Extreme.
Motorcraft 10w30 SD
If you can run a 15-40 oil in your particular climate, I strongly recommend the Mobil Delvac Extreme. I ran it in an 18’ Ram CTD and if I could run it in the 22’ I have now, I would not hesitate to use it. Truck just seemed smoother and quieter on the Extreme than any other 15-40 I tried in it.
Let me correct myself. ESP.