So recently, I bought a 1990 Jetta that runs, but makes a lot of noise. (Some of this is due to a hole in the muffler.....)
I changed the oil over to synthetic, bacause it's over 100k miles. But since I changed it, the oil pressure buzzer has been coming on intermittently. If I remember correct, the buzzer signifies high pressure, but I don't know what causes it. So, assuming my pressure switch isn't going bad (which is a common problem in VW's, I hear), what causes high oil pressure, and how do I fix it?
I'd like ths car to make it on a 200 mile trip I'm taking soon, but I don't want to drive it into the ground doing so!