It has been a while since my last older Mustang, so I've forgotten quite a bit on misc maintenance shit on these cars...

Need some recommendations on rear differential, transmission, and motor oils. The car has 134k miles on it, and to my knowledge, has only had the oil changed on a regular basis. What would you recommend for types and/or brands? At this point, would it be beneficial to go with synthetics?

 

I just switched to Royle Purple in everything. Felt a hugh difference when I changed the oil in November. Just did the tranny lastweek. Hadnt changed the tranny fluid since I swapped everything over a couple years ago. I dont think Ill use anything else from now on.

 

Royle Purple is great for the engine and read end.I didnt know they made trans fluid.

 

yeah its like $10/bottle. its the same stuff as GM Snychmesh (sp).

 

I would not suggest synthetics on a older car. It will find every leaky seal and magnify it x 10. Just make sure to remind me to get you some friction modifier for the rear end fluid.