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.
