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No, they are coated. It takes a special etching process on the surface to give the proper finish to the cylinder wall if the engine is ever bored out. I am unsure how much of a rebore could be done without losing the coating. The coating may be called "Nikasil", not 100% sure if this is correct.
Unsure what was done to address the guide problem that was mentioned, this is a completely different engine than the 116/117 engine. If your friends 380 116 motor was a double row chain, it was converted at an earlier date, which makes the failure of the guide at only 140K kind of confusing. I haven't seen a failure of this type on a 112 or 113 motor, and we have a few in service where I work at about 200K miles. These engines, I would like to point out for all the FSS nay-sayers, have been operated following the FSS plan and not even on synthetic oil.
I would assume under optimal conditions, using synthetic oil (yes, I agree it would have benefits in the long run) and mostly highway miles, probably around 300,000 miles?
Horsepower of the 320 is 215hp@5600. as stated in a 2000 ML owners manual.
We haven't had alot of sunroof problems (on the regular glass sunroof) on the ML's. May as well get used to it if you're buying used, it's hard to find one without a sunroof.
Gilly
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