Differential 80w90 vs 75w90

darli328

Doesn't 75w90 void your warranty? I wouldn't want any grief from a dealer when I bring in my own fluids...

DEpointfive0

FUUUUUUUUUCK NO... Not even close, LOL.

The diff is so useless on the car anyways

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SouthArk370Z

As long as it meets specs (any high-quality diff lube will), it won't void the warranty. If the dealer gives you any static about it, go to another dealer.

Same with all other lubes/fluids/tires/&c - if it meets Nissan's specs (for lubes, this is usually an API or other standards organization rating), they can't void the warranty.

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darli328

When you say meets specs are you talking about API 5 or are you talking about weights? Because 75w90 according to my owner's manual doesn't meet the correct oils weight specs.

SouthArk370Z

The API rating is the more important part. The difference in viscosity between 80W90 and 75W90 is insignificant even at low temperatures.

If you're that paranoid about it, go with 80W90, but I can't imagine using 75W90 ever being an issue with a warranty claim (assuming it meets/exceeds all other specs).

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darli328

Truth be told I already ordered some redline 75w90 when posting this thread based on reviews from people on here. But, I wanted to posts this and see what people thought because I just noticed it myself. Funny thing is my owern's manual says you can use 75w90 in the differential for automatic transmission models (I have a manual transmission) but is the differential for the automatic and manual the exact same thing/part?