oil?? tires????

i was wonderin if anyone had any good suggestions on what kinda oil would make my car run best..i have a 91 sl with about 85k on it manual tranny...also eventually i want to get 18's and i heard cars with 18's make the ride a lot more uncomfortable..anyone know any good tires that'll be good for grip, give a comfortable ride, and still look good?? thanks a lot

I use mobil 1 synthetic, and have sumitomo HTRZ 2s on 18. Larger wheels wont affect your ride comfort in a huge way, it just will be a bit bumpier on potholes and such.

well ive always used royal purple but synthetic is usually a good choice. as far wheels yes if you lower your car and have rims the ride will not be so great i have pirelli 7000s 35 series tires and you can't fit any bigger i don't think