Hi, my local garage is trying to find a fix for low oil pressure on my 1998
Audi Cabrio. It has got the 1.8 20V engine, but without the turbo that's
fitted to this engine in many parts of the world. It has done about 60 000
miles, and has been serviced regulary at a non-audi garage.
The problem only occurs when the engine is hot and only at idle.
I have read a lot about the "oil sludge" problem, but as far as I can
understad this problem is related to insufficient cooling of the turbo. Can
"oil sludging" also happen to my non-turbo engine?
When the mechanic inspected the oil filter, he found the bypass-valve had
worked itself completely loose - it dropped to the floor when he removed the
oil filter. The oil filter was changed about 8 months ago, so I'm guessing
the engine has been without a bypass-valve for most of that time. I know
very litle about engines, but I guess this really could be the source of the
oil pressure problem? That is, the engine has used unfiltered oil for 8
months and the internals are now worn to a state where it can not maintain
pressure. The mechanic noted that the oil looked very good (clean and
without paricles), though.
On a brigther side, the oil pressure has only been messured by looking at
the meter on the dash. The mechanic says he can't remove the cars sensor
without breaking it, but I told him to breake it if he has to. The
gass-meter has also been acted a bit strange lately. Are these two meters
interconnected somehow, and woth investigating?