Hi Revilla A quick scout around the web leads me to believe that petrol engines run at a higher temperature than diesel engines. Therefore, my assumption would be that diesel engine oil is not designed to cope with the heat generated by a high reving petrol engine and would create higher oil temperatures (which is what you are seeing). I have to add that I can, in no way, be considered an expert - it just seems logical to me. I always use the Comma Motorsport 5W50 oil. Simon