There is no "upgraded" tensioner for the M103 nor will there ever be one unless you are able to build one yourself. I thought about it when I took the one I had apart, but then I just scrapped the idea. The sad reality is that we are the last of a dying breed. I don't know of anyone that was born in 2000 or after that would bother with half the stuff anyone on this forum does. I was at a gas station about 6 months ago with a coolant leak and asked the guy (maybe in his mid 20s) if he could turn on the water. He had zero idea that the air machine also has a water feature nor did he understand why I would put water in my car. He also asked several of the other workers and one girl said she didn't know and thought it was "weird" that a car needed water. Funny thing is, I'm probably not even old enough to be their parents (well some of them I could be) and they all had ZERO idea! Interesting enough I see articles like the one I attached of a 2014 Tesla reaching 1.2 million miles after going through 14 motors and 3 battery packs and seems like everyone is amazed lol. And Here I am in my W201 with 580,000 miles and only 1 engine upgrade to the 3.0L at 531,000 miles.

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1990 190E 3.0L