[zeet]

Well, the 2.3l M111 has proven more durable than the 1.8l M271. They make about the same power. So that single data point says something.

 

[zeet]

About vehicles with more power being pushed less than a car with less power, it is not true. There is absolutely no way that anyone here can honestly say that if they sold a car with 200 HP and bought one with 500 HP, that you never push that car at wide open throttle.

Sure, but if it takes 80HP to get up to freeway speed in the time you regularly need, the 200HP car is working harder than the 500HP one, as a portion of total capability. A 100HP car can easily go speeds that are illegal in the entire country (think VW TDI).

 

[zeet]

If I've been misunderstood I want to empasize, I wanted to know if less PS/Litre meant durable engine.

Basically what we are saying is: no, not as a general rule, only kind of as a guideline. Honda engines have high PS/Liter, but most are quite reliable. 1970s GM Diesels have very low PS/Liter, and are incredibly unreliable. 1990s Mercedes Diesels have relatively high PS/Liter and are quite reliable.

 

[zeet]

We did not get the C180K or C200K in the USA, so specialists in that are unlikely to be here. With that said, the M271 was used in Formula 3, so it should be durable at much higher power levels and is likely unstressed even in C230K trim. Most of the problems in the USA are due to bad gas and low speeds, ie, head carboning.

 

[zeet]

146K w/ ASP pulley and still running strong. Should I be worried?

I wouldn't be worried. People abuse their engines much more by using the wrong oil, sitting all the time idling in traffic, etc.

 

[zeet]

I've been put Valvoline on last service in official service company, is it right one?

Look for MB 229.3 or 229.5 ratings on the bottle. Valvoline makes lots of different oils.