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I run 0w40 year round, and at many track days in the summer.
I have no issues getting the oil above 100 degrees Celsius in the winter, and no issues with oil over heating over multiple 30 minute track sessions on even the hottest summer days.
I have over 140,000 trouble free high revving kms with the 0w40 going in at 1000kms on the ODO.
UOAs routinely suggest I could double my 8000km oil change interval, but for the cost oil 5.4 litres and a factory filter every 8000, it's cheap piece of mind.
Fuel economy has never been a number that has entered into any personal equation. Engine longevity was my primary concern when making the switch.
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