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I have a 2008 GMC Sierra SLT 1500 with the Max Tow package - 6.0, 4L70 trans 4WD

I have been changing all the oils but I am unsure what to put in the front axle. The manual says: Front Axle (1500 Series) Four-Wheel Drive  use SAE 80W-90 Axle Lubricant

                                                                                                                                                                       or  Front Axle (1500 HD, 1500 AWD, 2500HD & 3500 Series)   use SAE 75W-90 Synthetic Axle Lubricant

I suspect the first is the likely one but I am unsure as the rear axle takes the later SAE75W-90 oil

How do you tell for sure? As I live in New Zealand I can't just go to the dealer & ask.

 

Thanks in advance

 

Russell

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Does your truck have 4wd or AWD?

 

If it's 4wd, then you use the 80W90, if it's AWD, you use 78W90 synthetic.

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I don't know what all is available there but 75w-90 will work just fine.  The difference between 75w-90 and 80w-90 isn't anything to worry about.

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