First off, I've never heard a ping or knock before, so I don't know if thats what I've got.
I changed the oil on my wifes Jetta the other day. (89, 8v ~250,000km) I put in 20w50 but I dont remember what I had in it before. The tempuratures been around 20C during the day 10C at night.
I was outside when she went out that night, and it was making quite a racket. When she came back it was quiet. Today we drove around in it all day and no noise. Then this evening, I went out and it was "pinging" again.
I can only hear it with the windows rolled down (or my head under the hood) It varied directly with engine speed. Over the 5 minute drive to the store and back, it disapeared.
I always leave before her in the morning so I have no idea if it was doing this before the oil change.
So, could this be a "ping/knock" or is this some other noise? It doesn't quite sound like what I've read about pinging in this newsgroup.
Am I using the right oil?
20w50 is what the bently said if I read it right.Any Ideas?