Partial flow oil cooler

[Wingphil]

Hi all
On an om642 which has a reputation for high oil temps I am fitting an oil cooler. Rather than aftermarket solutions I thought would use the factory option used on the pickup truck.
A partial flow oil cooler. The size I have chosen is basically the same as the aftermarket full flow option and a bit bigger than the factory partial flow solution.
The question is really related to do I need a thermostat, aftermarket and merc version don’t use them.
And the other is does a partial flow cooler have the same effect as a full flow if it uses the same size cooler. Obviously it only cools half the oil perhaps a bit cooler than full flow, then mixes it back into hotter oil, where a full flow cools the whole lot.
Anyway interested in thoughts.
Thanks.

 

[Kira]

Since diesels are said to be cooler running and/or take a long time to heat up, whatever you decide to do MAY REQUIRE a thermostat be included.

Where you live and how you drive might be factors.

An M-B site might have more members with specified knowledge and experiences. I had to look up om642.

If you can benefit from an oil cooler, maybe adding a transmission cooler is smart?

 

[oil pan 4]

Hi all
On an om642 which has a reputation for high oil temps I am fitting an oil cooler. Rather than aftermarket solutions I thought would use the factory option used on the pickup truck.
A partial flow oil cooler. The size I have chosen is basically the same as the aftermarket full flow option and a bit bigger than the factory partial flow solution.
The question is really related to do I need a thermostat, aftermarket and merc version don’t use them.
And the other is does a partial flow cooler have the same effect as a full flow if it uses the same size cooler. Obviously it only cools half the oil perhaps a bit cooler than full flow, then mixes it back into hotter oil, where a full flow cools the whole lot.
Anyway interested in thoughts.
Thanks.

Why not run a oil to coolant type oil cooler/warmer?
I have Kubota diesels that are up to 27 years old they typically run 140 to 160f and are fine. Don't worry about "over cooling the oil.

 

[Wingphil]

I do have one, oil/coolant,that would do nicely, but the cooling system is adequate at the moment, but does show strain up hills so adding more heat into the coolant seems counter productive. Although would keep the oil at the right temp. The factory one is not big enough but is in the v so you cannot actually do much with it.
I wanted a bigger cooler but got a good deal on one that is big enough…..

 

[CleanSump]

Do you have an X350d? We didn't get them in NA.
How are you going to plumb the external cooler?

 

[edyvw]

What are actual oil temperatures?

 

[Wingphil]

Oil temps are mostly in the good range, but on steep or long hills could peak over 125c with coolant staying below 100c.
It’s for these climbs that a cooler is needed. Especially as a tour of a mountainous area is planned.
I am going to use the x type points, block to filter casing. Using an12 hose to reduce flow restriction.
However I would use a full flow if I could locate a plate for the filter casing, but so far I have not found any in the uk.
I have to assume merc did their flow analysis and their take off return points do provide sufficient flow to make a difference……

 

[CleanSump]

The only kits with a sandwich adapter I know of are designed to fit Sprinters. That's fine for the adapter. And they include brackets for the steering reservoir offset. You might find you spent $1500 US to get hoses and a cooler that don't fit for the lengths and grill size you have in the pickup.
Note I looked into it for a W211, but decided it wasn't necessary nor practical for me.