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Differential 80w90 vs 75w90

Originally Posted by 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

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Old 03-29-2013, 04:44 PM   #16 (permalink)
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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.
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.
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Old 03-29-2013, 05:13 PM   #17 (permalink)
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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.
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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Old 03-29-2013, 05:43 PM   #18 (permalink)
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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).
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?
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