so i have a 2000 prelude with 100k, im trying to figure out what oil grade i should use. how many miles and what oil grade are you guys running? or what should we be using? thanks in advance

 

Use 5W-30 (all temps) or 10W-30 (15*F+ ambient), they're what Honda calls for. High-mileage oils work well. Synthetic not a good idea if the engine hasn't been run on it since the beginning.

Please search. This really is a topic that's been covered in this and other forums many many times.