Engine slap?

2001 CHEVROLET TAHOE
130,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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LEONANDAMY
  • MEMBER
  • 1 POST
Engine has a knock when first starting it up after sitting overnight. Knock goes away after 30-45 seconds. Knock does not happen after driving and shutting off and restarting.
Jun 23, 2024 at 9:44 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,051 POSTS
Yep, this is common on high mileage engines because of extended clearances in the rod and main bearings. I would change the oil and filter and use 20/50 weight and add lucas oil stabilizer. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

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Jun 24, 2024 at 9:17 AM
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