Captain47

Hi All,
I'm new to the forum. I'm also new to Mercedes ownership. 6 months ago I purchased a non certified 2014 ML550 from a California Mercedes dealership with 41,000 miles. It was serviced regularly, clean Carfax and was immaculate. It now has 47,000 miles.
I live in Wisconsin and drove all the way to California to get it as they are somewhat hard to find.
2 days ago I was cruising along at 70 on a freeway and suddenly it began running rough. I pulled over and had it towed.
Its now at a Mercedes dealership in Wisconsin and they tell me it has low compression in #5. They want 15K to start tearing the motor apart, and tell me it will go up most likely. They tell me #5 is at 150PSI and the rest are at 225PSI.
I'm at a loss for words. The selling dealer said tough luck and the Wisconsin dealer seems to think its no big deal.
Is this a common occurance on a 2014 M278?
Any feed back is gratefully appreciated.
Jim

exhaustgases

First off you could likely find a low mile used engine for alot less than that, and have some night owl tech swap it. The problem may not be as bad as they say, get another opinion.

biker349

contact mercedes directly and see if they will help.