
Can I hear an amen!
Sir,VStar650CL wrote: ↑Thu Nov 26, 2020 7:59 amI've said these things in other places and other forums, but this post is getting lots of traffic so it's worth posting here. Intro for those who don't know, I'm a Nissan/ASE master tech, 66 years old with 49 spinning wrenches.
CVT's are wonderful machines -- in fact, perpetual motion machines -- but they can never, ever be treated like a conventional A/T. One look at the guts will expose the reason for both: Metal belts riding on metal pulleys. Smooth power delivery under any load conditions. Optimum delivery. No bands, no clutches except forward-reverse (those can last almost forever). Nothing to ever wear out. Every regular A/T has a finite lifespan because it will eventually run out of sacrificial clutch material. No matter how much you baby it, it won't last forever. Your CVT can.
But -- the same lack of sacrificial material is also the CVT's great weakness. The fluid is very special, with enormous film and shear strength, simply because the fluid is the ONLY thing keeping the metal belt from touching the metal pulleys. Once it does, the trans is shot. If it never does, it's perpetual motion.
I was viewing our service records for another forum and discovered there are four cars in our files with 250,000+ miles and no record of a CVT replacement. Two Muranos, a Max and an Altima. One Murano is pushing half a million miles. The customers all share one common trait: They change the fluid like a religion. The old Murano has gone through an engine and has some other pieces that are falling apart (I've worked on it myself like almost everyone in the shop), but the CVT has seen new fluid every 30K since it rolled out of the lot new. I'm sure it will outlive the vehicle. My own '13 Altima gets it every 25K, the wife and I both have lead feet and shear force, along with heat, is the great enemy of the fluid. Drive like grandma and you can probably get away with 45~50K. But I've seen ignorant online comments about letting them go 100K before the first change and I want to scream. The quality of that fluid is the only thing separating your belts and pulleys from tragedy, and if they could talk they'd tell you 100K is plain abuse.
We all wish Nissan would downcost the fluid so a change cost less than a car payment, but I know many of you in this thread love your Nissans and want them to last forever. They won't, but the fact is, your CVT can. That Murano owner has spent less than $4K on changes, far less than the cost of a new trans, and the CVT is like new after driving everyplace from Maine to Alaska. You probably won't drive that far. So don't debate, just give it a kiss and spend the money. Perpetual motion is worth it.
Actually CVTs does accomplish more than just better MPGs. They actually reduce cabin noise of all things. I did a decibel reading when we had the 2016 Rogue and I did the same reading test on my (still is currently the main family vehicle) 2017 MDX. Auto trans are getting more complicated with ever new car model. And now we have 10 spd autos; who knows maybe in the future there will be 20 spds in an auto trans.casperfun wrote: ↑Tue Dec 01, 2020 12:31 pmI don't know, maybe it's just me, but I didnt grow up in a world where it seems the automatic transmission were failing alot.
It could be because there was no internet back then and I was never aware of it.
Just like I never knew if teachers were sleeping with their students long ago, but because of the internet it seems teachers are having inappropriate relationships with their students left and right.![]()
I'm just wondering if automatic transmissions would get a bad rap back then if there was internet or the world wide web as it was known.
The only reason we have the cvt was to improve gas mileage because the govt was mandating better gas economy, hence the whiny transmission with the fake shifting we have today.
I actually like the shifting of a good v8 oldsmobile back in the day or our v8 GMC van. Not the golf cart feel that they are serving now..![]()