Blow-By Test for 6.5L Diesel

Volume 2 Issue 1 - 6.2/6.5 Issues and Answers

I have always been a gasoline engine driver, however I am thinking about buying a used 1995-1998 Chevy or GMC diesel Suburban and need some advice in making a decision. Those I am looking at have more than 150,000 miles on them, which seems like quite a lot to me. How can I know whether the engine is OK? Do I need to have compression tested? Any help is appreciated! Jim – Amarillo, TX

Jim, we recommend that you check for crankcase blow-by vapor flow. This is the best way to determine the health of the 6.5.

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