theoldwizard1 wrote:Puddles wrote:theoldwizard1 wrote:
Motorcraft Super Duty 10W-30 Diesel Engine Oil is sold at Walmart for under $20. It is API certified CK-4.
Even the old non-synthetic transmission fluid was good for over 250F.
Did you mean CJ4 ?
Nope. CK-4 is the "top of the heap" for diesel oil at the moment.API Service Category CK-4 describes oils for use in high-speed four-stroke cycle diesel engines designed to meet 2017 model year on-highway and Tier 4 non-road exhaust emission standards as well as for previous model year diesel engines.
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API CK-4 oils exceed the performance criteria of API CJ-4, CI-4 with CI-4 PLUS, CI-4, and CH-4 and can effectively lubricate engines calling for those API Service Categories.
Thank you for the update... think I'll stick to API service category that the instruction manual states should be used in my diesel motor..
