The only car that I have owned that had an oil temp gauge was a Mk2 GTI. On a warm day travelling at around 110km/hr the temp would go to 110C. That car had a token oil cooler above the oil filter. IIRC when I spoke to someone in the oil industry they said oil was ok up to around 140C but don't take this as gospel but do your own checking.
Understand how it works, troubleshoot logically BEFORE replacing parts.
2001 T4 TRAKKA Syncro 2.5TDI,2006 Mk5 2.0TDI Golf manual,2001 Polo 1.4 16V manual [now sold], '09 2.0CR TDI Tiguan manual,
Numerous Mk1 Golf diesels
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