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Determine what gear oil to use if I have G80 code

Tiny
GROVER333
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I only want to use AC/delco oil but not sure to get the SAE 80w-90 GL-5 (not synthetic) or the SAE 75w-90 GL-5 which is synthetic. Also, if I get the synthetic to I need additive too?
Monday, February 17th, 2020 AT 10:29 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I posted the specs for you for both differentials. The second one is for the front.

No, to the additive.

Roy
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Monday, February 17th, 2020 AT 11:14 AM
Tiny
GROVER333
  • MEMBER
  • 2 POSTS
Thanks. This is helpful. I have the 1999 old body Tahoe. The years lead me to believe these specs are for newer model Tahoe. Can you please confirm?
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Monday, February 17th, 2020 AT 11:36 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The 1999 to 2001 is for your truck.

You are welcome.

Roy
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Monday, February 17th, 2020 AT 11:40 AM

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