Differential Oil Question - 2008 G35x
#1
Differential Oil Question - 2008 G35x
In a 2008 G35x sedan, Is it safe to use Mobil 1 75W-90 Synthetic in place of 80W-90 (which is recommended in manual)? If not, any 80W-90 synthetic recommendations other than Amsoil?
Also, what intervals should differentials be replaced at? How many total quarts for front and rear are needed?
I know these questions may have been previously asked but just wanted some updated opinions. Thanks!
Also, what intervals should differentials be replaced at? How many total quarts for front and rear are needed?
I know these questions may have been previously asked but just wanted some updated opinions. Thanks!
Last edited by g35at; 05-04-2013 at 06:30 PM.
#2
#4
In a 2008 G35x sedan, Is it safe to use Mobil 1 75W-90 Synthetic in place of 80W-90 (which is recommended in manual)? If not, any 80W-90 synthetic recommendations other than Amsoil?
Also, what intervals should differentials be replaced at? How many total quarts for front and rear are needed?
I know these questions may have been previously asked but just wanted some updated opinions. Thanks!
Also, what intervals should differentials be replaced at? How many total quarts for front and rear are needed?
I know these questions may have been previously asked but just wanted some updated opinions. Thanks!
If you don't have an 80W-90, then you should be OK with a 75W-90, just make sure it is a GL-5 spec. The Premium Maintenance interval calls for diff fluid replacement every 30K miles, but the Service 1 and 2 intervals only call for inspections all the way through the 120k miles that the service book covers.
IMHO, unless you like to spend money, you don't really need a synthetic oil in your diffs unless you are either towing or racing. There just really isn't that much demand on it (given that it's a closed system, not exposed to any combustion byproducts) that a regular dino product, changed at 30k intervals, wouldn't be more than adequate (perhaps even overkill) for the life of the car.
#7
I will probably still split the difference and do it at 45k miles.
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#12
Changed mine around 80k and I have a feeling the previous owner might have changed it as well since there was some torque seal on the drain plug. It stank like no other and was pretty dirty overall. It took no more than 1 hour to swap out fluid and cost something like 20 bucks in fluids and washer. Well worth it and extremely easy DIY to do in your garage.
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