Oil Recommendation

Q: Oil Recommendation

What oil is recommended for my 1968 engine.

A: My 1968 owner’s manual says that non detergent oils are specifically not recommended. It recommends the following SAE Viscosity Numbers:

Above Freezing (32deg.F.)………………… 20W or 10W-30
Below Freezing (32deg.F. and above 0deg.F.) …10W or 10W-30
Below 0deg.F……………………………..5W or 5W-20

All high output (H.O.) engines require the use of SAE #30 oil in the summer (above 32deg.F.) and SAE 5W-20 oil in the winter (below32deg. F.)

SAE 5W and 5W-20 oils are not recommended for sustained high speed driving.
SAE 30 and SAE 20W-40 oils may be used at temperatures above 90deg.F.
SAE 5W-30 oils may be used at temperatures below 32deg.F.
SAE 10W-40 oils may be used at temperatures between 0 and 90deg.F

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