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.

2 Answers

89,665

The main advantage with synthetic oi is longer distance between oil changes. You only drive a few miles per year, and extending oil changes is a bad idea. Oil, even synthetic, takes on moisture from the air each time it cools down after driving, and allowing a car to sit unrun for a long time allows the moisture to affect the engine. At less than 500 miles per year, you should change the oil/filter at least every three years; more often if you're in a humid climate. Synthetic will have no advantage for you.

1 people found this helpful.
14,135

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.

Your Answer:

Cadillac DeVille Experts

  • #1
    Js08016
    Reputation
    3,580
  • #2
    kikero
    Reputation
    2,540
  • #3
    Cynthiasmith
    Reputation
    2,260
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Impala
39 Great Deals out of 961 listings starting at $2,495
Used Lincoln Continental
33 listings starting at $37,000
Used Ford Mustang
40 Great Deals out of 1,799 listings starting at $5,750
Used Chevrolet Corvette
11 Great Deals out of 562 listings starting at $12,900
Used Chevrolet Camaro
34 Great Deals out of 932 listings starting at $9,870

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.