Oil dripping out of the tailpipe, possible blown head gasket?

1999 GMC SIERRA
175,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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RYANDONIHOO
  • MEMBER
  • 1 POST
Changed oil and filter, checked for leaks not a drop. i checked oil approximately 30 miles afterwards bone dry. again no leaks at all. walk around to the tailpipe and oil is dripping out?
Mar 9, 2021 at 8:11 PM
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I-SMOGEM
  • ✓ASE Certified Mechanic
  • 118 POSTS
  • ASE Certified Mechanic
Hey Ryan,

There's actually a number of potentials. There's much talk about the fuel management system that creates excessive oil use, plus - bad PCV valves, bad rings, worn cylinder walls, bad valve guides and/or seals, blown head gasket, intake gasket issues, hole in piston, massive blow-by pushing oil through vacuum lines via the intake, and I'm sure there are more.

With as fast as you are losing oil, you obviously have one, or more, issues. Below is one of our Repair Guides. I hope this helps.

https://www.2carpros.com/articles/blue-smoke-from-engines-exhaust

Any engine codes, have you done a compression check, and how quick did this become an issue (slowly, or all of a sudden)??

Much luck. Glenn
Mar 9, 2021 at 9:35 PM
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