How often should you change the transmission oil ?
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On manual transmission and iShift every 70,000 miles. CVT transmission fluid is every 25,000.
Search gearbox oil on forum - plenty of information, I use Castrol Syntrans Multivehicle 75W-90 gearbox oil for our manual cars, but for CVT only use genuine Honda ATF from Cox motors or your dealer as the fluid is formulated by gearbox maker to suit CVT, it needs a fine blend of friction and lubrication suitable for each different design of CVT.