best differential fluid 98 GT?

DTNODYA · May 16, 2006

I need to change my differential fluid .. (maintenance) and was wondering what the best fluid is. Also do I need friction modifier? What are some good brands and weights (preferably synthetic)? I searched but we know how that goes. Thx guys. I know what the Haynes manual says but want some personal opinions.

- J -

03ghoststang · May 16, 2006

i use Royal Purple as far as the weight goes you can use 75-140 or 145 cant remember or 75-90 full synthetic

Tally_4.6 · May 16, 2006

I used Pennzoil 80-90w with the 4oz of friction modifier.

stangGT97 · May 16, 2006

Tally_4.6 said:
I used Pennzoil 80-90w with the 4oz of friction modifier.

same here, no problems to speak of thus far

Pennywise2 · May 16, 2006

I changed my differentail fluid at 60K miles with Royal Purple 75W90
gear oil. After I changed it the differentail I could feel that it ran smoother
and seemed quieter.I am very happy with the Royal Purple gear oil. If you
have a 98 GT I recommend useing the 75W90.

DTNODYA · May 16, 2006

Cool, thx for the replies. Is there anywhere that sells Royal Purple or do you have to order it of teh interwebz?

Pennywise2 · May 16, 2006

I got my Royal Purple 75W90 from www.jegs.com

loosescrew79 · May 17, 2006

Got my royal purple from my local speed shop. They had it in stock

hognutz · May 17, 2006

I would just use the 75-140 royal purple. by the time you buy a good synthetic and the modifier the cost is pretty close to the same.

you can go to royal purple's website and find the closest dealer or order online.

best differential fluid 98 GT?

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