what oil is best for my car in the winter
 

Just got a 2000 2.7 biturbo quatro six speed. Need to change the oil any recommendations on what weight and viscosity to use for the winter??

On older cars the oil gets mileage (and climate) specific.
The factory suggested oil is 5W-40.
As with the mileage the clearances are getting bigger => one could use 10W-40, but for real winter I'd go with 5W-40.

There are many oil-related discussions on this forum - commit some time to research them.

I have been using 5W-50 castrol syntec. (If you ask me, it is magic) I had no issues with the oil. Generally speaking the first number relates to cold start up and the second number relates to extreme operating protection. Lower the 1st number, better it is in cold start, and higher the second number, better at high operating protection. nemohm has a point though... High mileage cars usually benefit from upper weight oil.

it has 54k on it what do you think?

0W40 mobil 1 year round. Thats what VW/Audi now recomends, thats what everyone I know uses.

Oh, and congrats on the find, 2.7T MT6, nice!!!

hxgaser,

When you open the oil-filler cup do you see yellowish coating on the internals?

Is it bubbly? If so, then you probably have some moisture in your crankcase. If it is just dark brownish coating, then it is just oil residue. Try seafoam eitherway. Worked well on many of my cars. FYI, high mileage cars with a lot of build up tend to (but not always) develop oil leaks after seafoam and other engine treatment. It takes away build up around old seals and starts leaking. I did mine at 75K, and small leak around valve cover gasket that I had got worse. I was planning on doing cam seals, tensioner seals and valve cover gaskets anyways, so it didn't matter for me.

+1 on Mobil One 0W-40.

5W-50 castrol syntec uses viscosity modifiers to supply the 50 weight. Those long polymer molecules leave yellowish contamination on the insides. There were a lot internet discussion about it.
It is hard to sustain wide viscosity range with non-synthetic molecules.

Oops I guess I miss understood your comment earlier. And to answer your question, I don't see any contaminants when I pop the cap. Call me crazy, but I am anal and do oil change every 3K even with synthetic.