New problems - A4 2.8 30V

[ricematthews]

Time for an update......
The patient:  '98 A4 Avant Quattro 2.8 30v

The first issue was the timing belt/water pump (also thermostat, rollers &
serpentine belt).  The dealer told me that
they recommend 60,000 miles for this service, even though the manual says
90,000.  The car has about 74,000.  When I took it in to the dealer to do
this work, I had a long list of potential warranty issues to have checked
out before my Audi Assured Warranty runs out in another 1,000 miles or so.

Included in the list were leaks in several areas of the engine, in the rear
diff seals, and at the PS pump.  Also low idle (about 650-700 rpm - slight
fluctuation - as shown on the tach) and a "rattling" noise on cold start up
(possible cam adjusters?).

After 4 days in the shop, I got it back last night.  The service
representative had told me that they think they fixed everything, but that
he thought there seemed to be a lot of smoke coming from the exhaust.  He
wasn't sure if this was anything to get alarmed about, so he suggested that
I take the car for the weekend and call him on Monday about it.  On my drive
home I noticed that there seemed to be a huge amount of smoke coming out -
with a weird smell too.  It doesn't smell like burning coolant or oil - but
it is definitely a new problem.  The other thing I noticed was that the oil
temp seems higher than usual.  Before it used to max out at about 200 deg. F
(as shown on the gauge) after a good bit of high speed driving.  Not it
shows 225 or so after only a relatively short trip.  Coolant temp maxes out
at the same point as before - directly halfway between C & H.  BTW - idle
speed still seems low.  Idle also seems slightly rough (could be my
imagination).

Does anybody know what the cause of the smoke and/or increased oil temp
could be?

TIA.

-Mark Rice