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I'm using 10W50 Fuch Titan Race engine oil and running in tropical hot country, car is stock condition and seldom boost the car, will this actually make the engine works harder because of it's high vicosity ?
 

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what should it be 0W40? not sure about the engine working harder, might increase engine wear though as the oil might not be thin enough when hot due to the small tolerances of newer engines so it won't get in all the places it's meant to. I wouldn't have thought the fact that your in a tropical climate would make alot of difference to the overall running temp of the inside of the engine tbh.
 
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