N_Jay
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Apr 23, 2026
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Apparently the seals in the oil cooler fail due to high temperatures. Parts guy said new coolers have improved seals but that might be BS.
My 2010 diesel had 90,000 miles on it when the leak started. Drove it for three months with the leak. It was just messy on the garage floor in the beginning but it got worse.
Ordered a new gasser when I picked up my repaired vehicle. I am keeping the diesel as a beater though.
Good luck!
Originally Posted by SmokinReefer
Had the dreaded oil cooler leak fixed by dealer almost two months ago. Parts were cheap but labor to take everything off the top of the engine and put it back was a killer. Dealer knocked $1000 off to get the bill to somewhere around $3500. Apparently the seals in the oil cooler fail due to high temperatures. Parts guy said new coolers have improved seals but that might be BS.
My 2010 diesel had 90,000 miles on it when the leak started. Drove it for three months with the leak. It was just messy on the garage floor in the beginning but it got worse.
Ordered a new gasser when I picked up my repaired vehicle. I am keeping the diesel as a beater though.
Good luck!
$4500 knocked down to $3500.
I have to believe some of that was for other work.
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To make your DIY catch can more effective, fill it with steel wool. The increased surface area will catch more oil vapor. Adding a drain valve will make your draining easier like a Fumoto or EZ drain.Originally Posted by dieselfanatic
Here are the rest of the pictures couldn't get them in one upload. Just imagine how much oil must be sitting in that intercooler and plumbing system after 50,000 miles. So Glad I did this early on my jeep now the R320 can be oil free too
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oldsinner111
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Mar 24, 2019
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people need to learn to service their own cars.I did not know anything about diesel till I bought one.I fix and repair it myself,thanks to the internet.
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I agree but in this case, you really have to know what you're doing to diagnose the problem, and repair it. Even then, if it had been the oil cooler, I'm pretty sure I'd have wanted the shop to do that.Originally Posted by oldsinner111
people need to learn to service their own cars.I did not know anything about diesel till I bought one.I fix and repair it myself,thanks to the internet.
That being said, why Mercedes put an oil "cooler" inside the engine block is a complete mystery to me.
N_Jay
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Apr 23, 2026
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That being said, why Mercedes put an oil "cooler" inside the engine block is a complete mystery to me.
It's called packaging.Originally Posted by 5hundo
. . .That being said, why Mercedes put an oil "cooler" inside the engine block is a complete mystery to me.
They were just filling otherwise wasted space.
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They were just filling otherwise wasted space.
Well, I'm sure you could find some unused space at the top of your oven for a mini-refrigerator but from a standpoint of practicality, it doesn't make much sense... Originally Posted by N_Jay
It's called packaging.They were just filling otherwise wasted space.
N_Jay
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Apr 23, 2026
If it weren't for a poor choice of seal material, no one would think it was a bad idea.
The guy who put it there probably did not pick the seal.
The guy who put it there probably did not pick the seal.
Its more than just picking the right material for the seal. The expansion rate of these two parts are different. So they can expand and contract at different rates. Mercedes should have done better in R&D. Ford diesel F350's also had similar issues with locating the oil cooler in the same location. Unfortunately, nobody really knows what is the exact cause.
I just ordered a ProVent 200 of my 2008 R320 CDI. Any tips on installing?
