What oil viscosity should I use for a 1965 Mustang?
Documented on the 1965 Ford Mustang build
Published August 3, 2026
Use the viscosity recommended for your specific engine and climate.
Full Answer
Use the viscosity recommended for your specific engine and climate. Many classic Mustangs with small-block V8s commonly run 10W-30 or 5W-30 modern oils; check the engine's service manual or consult a trusted mechanic for the best choice.
Documented In This Build
Related Knowledge
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Related Parts
Engine oil (5 qt)
Mobil 1 (example)$40
Oil filter
Motorcraft (or equivalent)$12
Drain plug crush washer/gasket
$1
Replacement oil drain plug (oversize/standard)
$10
Related Tools
Floor jack
Jack stands
Socket set and ratchet
Shop rags and gloves
Oil drain pan
Funnel
Oil filter wrench
Thread tap / bolt extractor / helicoil kit
Torque wrench
