CL-4 Archives

CL-4

Two API "Donut" certification marks for heavy-duty engine oil : the mark on the left identifies the FB-4 category (highlighted in red) with a 10W-30 viscosity grade, and the mark on the right identifies the CL-4 category with a 15W-40 viscosity grade.

API Launches New Diesel Oil Service Symbols: CL-4 and FB-4

The American Petroleum Institute (API) announced that the new API Proposed Category 12 (PC-12) heavy-duty engine oil specification has been formally approved and will be incorporated…

April 13, 2026

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CL-4

API Launches New Diesel Oil Service Symbols: CL-4 and FB-4

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