That's a good question. I know from watching the Nascar religiously that oil temps are usually always higher than water temps. Since water in the GTI's sits at 90 degrees, 103 for the oil doesn't sound bad at all.
I too would be interested to know when you need to start backing off, but I'd say it's much higher than that. Plus, the car has a warning light for when it really does get too hot.
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