i m thinking doing the differential fluid change. is royal purple good brand? or should i go buy redline? also how much oil do i need?

 

I did mine 3,000 miles ago with Royal Purple MaxGear. It's a GL-5, which is the correct specification for the S2000. Good stuff IMO. Get 2 quarts and you'll be covered. Fill it until it begins to spill from the fill hole.

BTW, I also used Royal Purple SynchroMax in the trans. It's a GL-4 which will be correct for the sensitive synchronizers in the trans.

Good Luck.
-Dave.

 

the ever popular and always referenced OIL JOURNALS

 

2 qts. will do TWO diff fluid changes and you'll still have about 1/2 qt. left over for the 3rd one. Each diff fluid change needs about 0.75 qt.

 

I allowed for spillage

 

royal purple isn't very good for the cost. there are much better oils out there for that price.