I was told by the machanic who changed the engine in my 1999 grand am to use 20/50 instead of the recommended 5/30 oil my car has 134000 miles and ran great till I got the engine changed! Help Please I don’t think its a good idea to put 20/50 oil!!

Using 20/50 motor oil instead of 5 or 10/30

common-sense-answer February 20, 2011, 6:18pm 2

I Agree. I Don’t Think It’s A Good Idea. Sometimes People Do This In Order To Avoid Repairing An Engine Or Replacing An Engine That Has Excessively High Oil Consumption.

CSA