I bought my 2002 Z71Suburban four years ago. It had 128,000 miles. It now has 240,000,easy maintained miles. It still runs and looks new! Gm manual calls for 5w30 engine oil. I run a synthetic blend. My question is should I run a thicker oil in the summer. Thanks,James

James Bass

Asked by Jun 09, 2013 at 08:47 AM about the 2002 Chevrolet Suburban 1500 LT 4WD

Question type: Maintenance & Repair

High milage and thin vs thicker oil in summer.

3 Answers

Tom Demyan

As long as it's running Ok, use the 5w-30. Are you experiencing leaking? If you want to you go to 10W-30 with no ill effects.

1 out of 1 people think this is helpful.

I'm with Tom all the way on this one. I went to 10w30 on my Tahoe when it hit 175000 and it cured a start up lifter noise it was getting. Sold it at 288000 still running good.

1 out of 1 people think this is helpful.
James Bass

Thanks guys. It has bery lifter knock in mornin stsrts if sat for couple days. It stops in afew seconds apsoulutly no lesaking,runs like new. Just thought 5w30 to thin for summer. Hope get 400,000 out of it.

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