I'll get panned even worse than you, ha. My 2012 with 170k miles? It's more than once gone 15,000 miles between oil changes (more than the interval for the new folks here). Heck, there was a whole 3 years it didn't even see a car wash. Mind you, it tows trailers and goes places some Jeeps don't even go. The most major part I've had to replace was the alternator after it got caked up with mud. Compression remains excellent, transmission is as sharp as ever, and it still drives almost as good as the day I rolled it out of the showroom.I'll probably get panned for this, like i did years ago, but my smart now has over 208K miles on it, so i must be doing something right. I change the oil every 5000 miles, do all my own servicing, and drive it like i stole it.
As others have touched on, the most common transmission failures are the shift motors and clutch actuator. I am unaware of any reports of a mechanical failure of the transmission that didn't involve extreme abuse, so mechanically it's very reliable. Being a manual (even if it's automated) the clutch will eventually wear out, but they seem to last a reasonable amount of time. Both of my cars have in excess of 100k miles and while the clutch is getting thin on the parts car, it still works(1). As I haven't owned either from the start, it's entirely possible that they have both had replacement clutches installed, but I think both are on their original clutches.impressive and happy to see several smarts last more than 100k. Thanks for sharing the tips.
One more thing I worry is the transmission. I have seen so many posts saying the transmissions had issues, for example: not being able to reverse, getting stuck at first gear, the lever was shifted to D but the dashboard still showed P... etc
Is there a way to prevent it? Change the transmission fluid more frequently helps?