[s-cars] Synthetic oil?

[Taka Mizutani]

Just my preference, but I used Mobil 1 10W30 in the winter, 15W50 in
the summer. With 5k intervals, seemed to work quite well, no issues
with oil consumption or lifter ticking. Some other oils I tried were
problematic- Castrol Syntec 5W50 made a huge lifter racket on cold
starts. I only use synthetic oils now, especially in turbo cars, have
done so since 1992 or so.

I'll note that for whatever reason, the Beetle likes Castrol Syntec
10W30 better than Mobil 1- Mobil 1 results in some oil consumption,
Castrol Syntec shows practically zero consumption- dipstick stays
constant for 5k miles.

We're running Castrol Syntec 10W30 in the Beetle, some unknown
synthetic supplied by the dealer in the Volvo V70R and Mobil 1 10W30
in the STi. Previously used Mobil 1 0W40 in the A4. I may try 0W40 in
the STi to see how it runs with that oil- highest specification Mobil
1 grade available in the US. Recommended 5W30 or 10W30 in the STi, but
I'd like to try the 0W40 just to see.

Taka