How cap sizing works
Why envelopes and the mid-size gap matter.
Cap-socket fit
Oil filter cap socket by diameter mm
Measure the filter cap outside diameter in millimeters. Match a 7, 14, or 30-piece set — or NO_MATCH including the 39–64 mm gap.
Cap-socket fit
Result
7 pc: 24–38 mm · 14 pc: ~65–100 mm · 30 pc: ~65–108 mm. Gap 39–64 mm → NO_MATCH.
From measurement to decision
Open the calculator
Same tool with worked checks.
7 vs 14 vs 30 piece
When each set fits.
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