View single post by gmgiltd
 Posted: 01-02-2017 07:40 pm
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Joined: 07-10-2012
Location: Whitehills , United Kingdom
Posts: 152
IMHO - Normally the optimum oil temperature should be in the range of 80-100C but most modern oils will tolerate up to 120C before oxidation starts to be a problem ( I use a Mocal oil thermostat which opens at 80C)
You need to keep in mind that the car was sold worldwide so the original design had to allow for a variety of of climates and types of use from city traffic jams in hot weather to cruising around in cool weather and everything in between. Also oil takes longer to warm properly than water typically 20 minutes instead of 5 minutes and correct oil temperature has a significant effect on its properties. Rule of thumb is that the idle oil pressure when properly warm will be much lower than from a cold start and gives a good indication that it has reached the correct temperature.