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Re: audi a4 1998
Yes they have hydraulic tappetts in them,changing the oil and filter sometimes help,forte do a top end treatment which is fantastic but difficult to find as its a trade sale only....but they normally get quiter if you rev it up a little...
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1) Is the oil actually low on the dipstick?
If it is, you might have an oil leak, so you would need to look underneath and see. Also look for puddles when you park.
The most common reason for such consumption would be a burst oil pressure switch, or a leaking valve cover gasket.
Either of these will leak lots of oil.
The last possible reasons, which are really rare, would be engine parts defective,( like oil rings), or a leak in the brake booster which would suck oil from the crankcase into the brake booster.
2) If the oil is not leaking out, and the dipstick shows full, you will be needing a new oil pressure switch, or to have the electronics repaired.
God bless your efforts.
That seems to be a common issue with several Audi models and is reported as being caused by the PCV system. There's a manufacturer that produces a fix for it (link below) and while I couldn't say for sure if that's the problem, a call to them might help to narrow down if that is, in fact, the issue. BSH FSI 2 0T PCV Revamp BSH Speedshop
There are some common things that causes a misfire, one of them could be a faulty spark plug or a bad spark plug wire, another could be a clogged fuel filter, if both of those solutions fail try having the timing checked. Good luck.