API Service Category CL-4 and API FB-4 'Donut' certification marks enable oil marketers to align with 2027 heavy-duty engine standards.
API PC-12 oil specification approved with CL-4 and FB-4 marks available ahead of 2027 licensing and new engine oil performance standards.
Note With version 3.0.0 oazapfts has become a runtime dependency and the generated code does no longer include all the fetch logic. As of 6.0.0 the runtime has been moved to a separate package, ...
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