Thanks for the reply. Measuring the temperature of the oil did cross my mind; I was planning on fitting an oil cooler for the summer so perhaps I could drill a hole in one of the oil passages on the radiator/oil cooler, stick a probe in and seal it up with JB weld. I would imagine that the cylinder head would be the best place to get a reading from however. Do you have any idea what could be considered dangerous temperatures for the oil and the cylinder head area?