98seblackmax

Im new to Subies and I am looking at a cheap '96 Legacy with the 2.2 L (EJ22?). The car is at 138K and it's used so it's maintenance history is unknown, though the sales guy claims it was well taken care of. I was wondering does this car need a valve adjustment at this point or is there any way to tell by the engine sound? I dont hear any major ticking but the valve covers are oily. The engine sounds and revs smoothly except that it rocks a bit from soft motor mounts.