Phil,
I'm getting similar advise from Shell after Bernie's recommendation (what a speedy service). Here is there comments:
"If 115 Deg C is the temperature in the sump then it is far too high. Oils usually run at somewhere in the 85 - 95 Deg C range. Every 10 degrees rise above about 90 HALVES the oil life. So in this case your oil life would be significantly reduced.
I suggest a few steps for you;
1)get the probe looked at as it may be contacting some hot metal 2)check that the oil cooler is appropraite and not blocked (if fitted) 3)try an oil of lower viscisity as this would transfer the heat away quicker
There is no danger that the oil would ignite or burn, but it will degrade and thicken at these temperatures.
I have responded for more information, but it looks like I'll be changing to the lowerer viscosity to see if that makes a difference.
As you say oil is cheap unless you have to buy it in barrels!!