GL320_CDI

Hi,

I have a 2008 GL320 CDI and the oil cooler seals need replacing. Vehicle has 370,000 km / 229,000 miles.

I have already replaced the crank case vent and the PCV. This slowed consumption but there is still an annoying 2 quarts per 500 Kilometres / 310 Miles that requires topping up.

The previous owner never replaced the oil cooler seals.

Since I am getting in to this lengthy job, what else can be repaired replaced when getting into the oil cooler seals and appropriate gaskets / bits? I mean since it is a deep dive into the engine, what else can be easily accessed, or replaced while there?

I would rather replace / repair as much as possible than have to tear into the engine again.

It is like the old saying, measure twice, cut once.

As an example, would it be wise to get into the head gasket at this point? Fuel injector o-rings? Etc.?

Thank you kindly

lkchris

We will assume you mean o-rings.

GL320_CDI

Hello,

Yes, that is what I meant and I have updated the post.

Thanks

DennisG01

You mentioned that the engine is "consuming" 2 quarts per 300 miles... which is ALOT. But that is different than a leak - which is what changing the oil cooler seals would take care of (a leak). Unless you're getting oil in the antifreeze... but then your AF level would be rising very quickly. So if it's consuming oil, we need to look elsewhere.

There's not a whole lot else that is "worthwhile" to change while you're in there, though. But the fuel injector seals would be a good idea. I'd also closely inspect your intake runners and swirl motors for being gunked up.

GL320_CDI

Hi Dennis,

Thank you for replying

Previously the GL320 was consuming about 5 quarts every couple of days. That was terrifying.

As mentioned previously, I replaced the crank case vent and PCV (valve and tubing). The original Crank Case seal was worn and open and definitely allowing oil to get past into the PCV and turbo.

Following that, there was no more black exhaust smoke and oil consumption dropped considerably to the mentioned 2 quarts every 300 miles.

It is a real head scratcher in terms of where that oil is going.

I was thinking of also adding a catch can and re-routing the PCV hoses to vent back into the system through one of the air filter boxes for the engine.

That turbo is so powerful it seems to still be sucking oil in my mind out of the crank case vent.

Just sharing some of my thoughts out loud and appreciate your time and help

wae

Ah, that's quite a bit of oil to be losing. If you aren't leaving a puddle everywhere you go, for that kind of oil consumption I'd be looking at rings and/or valve seals. I'm not aware of valve seals being a normal weak point on these, though, but I believe that they are known to need to be re-ringed.

a2j

I would not touch the head gaskets for no reason. Injector o-rings can be replaced without taking all of that apart. I just did the second one. I suggest you clean EGR while you are there. I'm assuming you are going to install a new swirl flap motor.

DLB_Adelaide

I have seen vids where they replace inlet manifold gasket, turbo gaskets, intercooler orings. Give everything a good clean while having them off as well.