i judge it from my oil pressure gauge as I dont have an oil temp one
warm idle gives me just over 2bar, cold is off the gauge at over 7 bar. I stay off the boost from cold till my warm idle gets down to 3.5 bar and then it's gentle boost staying under 3000rpm till my warm idle gets under 2.5 bar, then I can drive more agressively if i want, although london traffic means i can't most of the time lol
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