I'm watching this video on oil, and if I understand this correctly, the engine oil temp should be between 100C & 115C in order for the oil to keep its operating temperature viscosity.
Beyond this point, the oil will not be at the 30 viscosity that your engine requires.
skip to 5:43 for the section on viscosity:
[youtube]6VLMfUz34R0[/youtube]--
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged
The rated viscosity is tested at 100deg C. Good quality synthetic oil with a good viscosity index will handle the higher heat without thinning as much - although the viscosity will still be reduced with higher heat. Another point is the oil life will degrade by oxidation twice as fast for each 10degC increase in temp
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