Just been talking about this over on a car site I frequent. The topic came up because someone had much the same concern about his oil temp:
"The temp gauge scale goes to 140 DegC and the needle goes above that when the engine is being used hard"
Main reply was -
"140°C is very high but not critical.
I'm not certain about what "semi-synthetics" are capable of but the problem with mineral oils is that they quickly start to oxidise at about 150°C
Fully synthetics will cope with 150°C OK & take short periods of 165°C before that happens."
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