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Oil for turbocharger
It's a good idea to let the oil warm up in any turbo
engine prior to making boost.
The Ur Quattros actually have a "low temp" idiot light
to warn against boost at low oil/water/engine temps.
And if you're real observant, and it's real dark outside, and it's real
cold, you can see it dimly glow for a few moments after you start a cold
engine. I think I last saw my little blue "cold" light back in April some
time when it was still below 50F outside...I just make sure I wait for
"a few" minutes to assume the engine has warmed up, since the "ur" doesn't
even have a "water temp" gauge, let alone an oil temp gauge.