I have 2 e30s… Have put over 15,000 miles on each with little to no maintenance. Changed clutch at 119K. The other has 215,000+ miles and runs like a champ. I wouldn’t recommend anything other than ensuring your drivetrain fluids are full/fresh. Also, inspect the cv boots while you’re doing the brakes and make sure they are not torn/cracked. Just visually inspect underneath the car and use common sense if you need to replace anything… that has worked best for me and e30s.