So the wife's 2017 Hyundai Santa Fe w/the 3.3 and 6 speed has 43,000 miles on it and is coming up on four years of ownership. I noticed a degradation in the shifts of the transmission. I researched garages and found one - a garage/tire shop chain here in Utah that uses Valvoline Maxlife Transmission fluid. I made an appointment. After waiting an hour-the manager came out to apologize for the delay and said that are doing an additional cycle of fluid because the fluid was burnt and looked very poor. So my advice is to change the fluid out around 30,000 miles. It turns out the dealers recommend a 50,000 mile flush-and Hyundai says it's "lifetime". Which I guess means 100,000 miles-the length of the power train warranty!
It should be noted in this case the dealer recommendation is actually better for your vehicle than the manufacturer.
I didn't attempt this my self because it's simply awkward to perform service on this transmission in this particular vehicle.
It should be noted in this case the dealer recommendation is actually better for your vehicle than the manufacturer.
I didn't attempt this my self because it's simply awkward to perform service on this transmission in this particular vehicle.