Bad lifters/ oil pump
1997 D21. Noticed my oil light has been staying on for about 7 seconds after start, also some noticeable valvetrain noise at idle. This is after a fresh oil change, and I went up a weight to 10w40. I'm going to test the oil pressure soon. I think it has an actual oil pressure problem from the noise its making. Do yall agree I'm going in the right direction?