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Is this OM642 V6 diesel the most difficult motor to work on?

8.6K views 7 replies 6 participants last post by  DAZZLER ML350  
#1 ·
Hi guys, I have a 2009 ML320 3.0 diesel, W164, 120k miles for 4 years now.
I live in Brazil and bought it with 62k miles. It is an armored car, so +250kg of kevlar and thick windows.

I have worked on other cars like hyundai veracruz, vw touareg v8 and chrysler town and country v6 but this mercedes is by far the most complicated.
Nothing comes easy when you make repairs.
Everything I need to do takes much more time and a LOT of patience.
Since I own it I have done the following:
in 2016, battery change, not a simple task as in other vehicles.
in 2017, all 4 shocks and remove the turbo to clean and inspect due to several limp modes and codes P2616 / P2526.
still in 2017, replace 3 glow plugs, diesel filter and insert the 4.7k ohms resistor on the swirl flaps plug. Replace the trunk lock.
2018 was easy, no major manteinance.
in 2019, repair of the glow plug module, opening it and soldering wires.
Replace turbo actuator, and 3 glow plugs in february.
In abril replace the turbo actuator again and 2 more glow plugs.
Did the oil cooler seals as the oil dripping got severe, not an easy task.
in 2020 replace 2 motor mounts and 1 trans mount. The right motor mount was difficult to replace, need to remove the alternator, hoses, etc...

This car is great but every time I have a problem it is time consuming and sometimes I wish I have a simpler car.

I would like to know your experience with this car, thanks.
 
#5 ·
It’s all relative though and there is a reason a used Mercedes SUV costs half of what a Toyota of the same age costs. And the Toyota was like 60% of what the MB cost when new!

I don’t think it is that difficult to work on. Try a B6 or B7 Audi S4. That is amazingly difficult to work on , those jokers thought it would be funny to put a V8 in a car designed for a 4 cylinder.

Or how about some cars like Porsche that require you to drop the engine to do things.

And as far as it being a POS, the gas motors that eat cams are far worse IMO.

What I do really like is all the high quality fasteners. Work on a 5 year old American car and you spend about as much time praying that bolts won’t break as you do doing the actual work.

What gets my goat is why these (all newish MB) 60k+ cars leak oil like a Harley Davidson after they pass 50k miles. Though it is nice MB installs a tampon on the underbelly pan so you aren’t embarrassed from stains on your driveway!
 
#7 ·
i bought my 2007 ML320 CDI @ 32k. Had oil cooler leak fixed at 50k. Has been relatively trouble-free since. Now 140k The only other unscheduled problem was front link noise and hydraulic tensioner for the timing belt (30 minute job). I guess i was lucky (still crossing fingers).