1.Clean the engine block all around and below the flywheel - YEARLY. Also the cooling fins. Remove all oil, dirt, grass and grit. That oily dirt layer insulates the block and fins retarding cooling.
I like my infrared thermometer but learned they have to be calibrated to the material be checked. A muffler would be different than a steak or skillet or painted block. It is about the reflectivity. Should not be hard to figure out from info on the net what the approximate adjustment should be for your device and what you are measuring.
Also, if it has the yellow plastic dipstick, they will turn dark when overheated. They will darken up some naturally over time, but you will see a much darker color when they've been running hot. This holds true for most engine manufacturers who use plastic dipsticks.
The laser temp reader is just that Actual temp. Do a search for normal temps for your engine, then use your expensive Mac, You might consider getting one from the Snap On truck and do a comparison for accuracy.
