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MLK2015

2015 Rear Axle Gear Oil

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I changed the PTU and rear axle lube last week at 18,000 miles and used Red Line 75W-140 synthetic lube in both.  Will the 75W-140 cause any harm in the rear axle? I don't tow and and the AWD has only engaged maybe 3 times in the last 4 years. Should I go back to 80W-90 gear lube to be safe?

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If the OM calls for 80w-90:then that’s what you need.  I’d change it.  That’s a big difference in hot viscosity.

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2 hours ago, MLK2015 said:

I changed the PTU and rear axle lube last week at 18,000 miles and used Red Line 75W-140 synthetic lube in both.  Will the 75W-140 cause any harm in the rear axle? I don't tow and and the AWD has only engaged maybe 3 times in the last 4 years. Should I go back to 80W-90 gear lube to be safe?

 

75W-140 is for your PTU. Redline offers 75W-90 for your differential.  75W-90 is a suitable alternative for 80W-90.

https://www.redlineoil.com/75w90-gl-5-gear-oil

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I used Redline 80W-90 in the RDU

 

Why would you change the oil weight?

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