oil replacement

Asked by GuruSBH19 May 25, 2019 at 09:11 AM about the 1973 Cadillac DeVille

Question type: General

Is it a good idea to change a 1973 cad. from havoline 30 wt. oil to a full synthetic oil.  I bought this car new.  It has 66,000 original miles.  Driven less than 300 miles/year.  Stored inside.

1 Answer


Stick with the 30wt. oil unless there are other problems you are trying to solve like difficult starting in cold weather. Then you may want to go with a multi viscosity oil like 10W-30 but stay with the regular oil rather than a full synthetic.

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