Castrol GTX has higher viscosity , it works, but its not the best. A high viscosity oil designed for high horsepower racing engines, not the GX160.
People Like RPM have been working Morgan Fuels who produce the coolpower range for quite a few years now and why do you think RPM use cool power oils ??.
Test it your self.
Go to your track, set the kart up and keep it the same all day.
Test on your best oil.
Record all the lap times.
Test again with cool power oil.
Record the laps.
Look at the times, !!!!
This is why cool power oil is used by over 60% of Hondas in the UK, Last year over 8,000 oil changes in the UK with Cool Power Racing oil.
Cheers Trev
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