DIY: Rear Differential Oil Change

Chad7088

For AT and NISMO models:
. API GL-5 synthetic gear oil, Viscosity SAE 75W-90
Except for AT and NISMO models:
. Genuine NISSAN Differential Oil Hypoid Super GL-5 80W-90 or equivalent
conventional (non-synthetic) oil


Just curious....this is from the owners manual. I notice a lot of you are putting synthetic diff oil in. Why would nissan recommend this and why are most all of you ignoring it....just asking because i want to do the right thing for my vehicle. What would it hurt to put a synthetic oil ( im asking because this is what i have available in my garage) instead of convention in my Z sport?


Thanks in advance!

Quicksilvers

I would disregard this manufacturers recommendation as any quality synthetic API GL-5 differential fluid will suffice for our application. A 75W90 gear oil is a suitable replacement for a differential calling for an 80W90 or SAE 90 gear oil. I recommend 75W90 synthetic Redline gear oil or equivalent.

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Mr. Clean

Quicksilvers

Changing your differential fluid on time is key. Not changing your differential fluid on time or when required is detrimental. I try to keep taps on my differential and change my differential fluid every 30K or 3 years. Attending track events I will change differential fluid after every event. Inspecting my differential fluid during a flush and refill I have found very small pieces of metal in my differential fluid before.

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Mr. Clean

Chad7088

Thank you sir! I agree a synthetic high quality gear oil is mandatory.....It just is odd why Nissan would recommend two different types of oil. The differentials are the same on the Nismo and Sport....correct?