Hello Everyone,

This weekend I want to change the rear gear oil in my 93. Do I need gear oil with or without additive? I thought I read somewhere that if I used the royal purple (with additive) that I would be fine. I'm guessing using the additive(pre mixed in royal purple) can't hurt.

 

If you have the factory limited slip, you have to add the additive. However, I believe if you use synthetic, I've heard you don't need to put in the additive. If you don't have the trakloc factory limited slip, you don't need any additive.

 

I decided that I should just go full synthetic and put 75W140 in the rear.

 

Let me know how that works i am about to do mine.

 

I used Lucas synthetic. No need for additives. Good stuff, highly reccomend Lucas products. I run it in everything.