You can check to see if the oil cooler getting oil flow or not. After a good highway drive, open the hood and feel the top of the oil cooler. If it is hot, oil is flowing through it.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Ok, will do.
Thanks for the ideas, everyone!

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1982 240D automatic
Odometer quit at 307K...about 325K now

Ok, drove it 10 miles on the highway (60 mph).
I did notice that after getting off the highway, the oil pressure at idle was back to its usual level (~1.8 bar). I checked the oil cooler (this is the long, rectangular mini-radiator next to the radiator, correct?) It was just barely warm (maybe 120 degrees F, as a guess...about the same as the radiator hose). Nothing like the valve cover (too hot to keep a hand on long). I then drove a few miles, in case the cooler had just started functioning, but it remained the same temperature. Is it supposed to get hot like the engine, or warm like the radiator hose?

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1982 240D automatic
Odometer quit at 307K...about 325K now

I'll chime in here just because I have recent experience with my '81 non-turbo 617. After I replaced my oil lines about 3 months ago I kept popping the hood and checking the temperature of the fittings and cooler. Even after a 3-hour highway run at 75-80MPH in the worst heat of July I never felt hot oil going to my cooler, indicating the oil thermostat wasn't opening. Either my T-stat is defective or the oil just wasn't reaching a high enough temperature to open it.

Maybe the oil cooler is really only needed for towing a camper across the Saraha?

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'81 300CD - 180K, cannot be killed by any conventional means
'99 Ford Escort - good MPG

watch your engine temp closely. I have noticed that my oil pressure only drops when I go above 80*

often, driving around town will not warm the engine sufficiently to drop the pressure.

high oil pressure is better than low pressure as long as it responds to throttle.

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Ok, I'll treat this as a "bears watching, but no action" item. This is my first year with the car but the only time it got a bit over 80 was during a really hot day when I had the air on max.

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1982 240D automatic
Odometer quit at 307K...about 325K now

To put all doubt to rest about engine/oil tempuratures, use an Infra-Red temp. sensor. Just point the red dot at what ever area you want to check. can be set to C or F temp readings.

I thought I was having high temps with my new engine, changed the temp sensor/ t-stat, temp gauge in dash. then bought a Sears Infra-Red and put all fears to rest.

The coolant radiator and the oil cooler radiator both work the same way, they both have a thermostat. the oil cooler has the T-stat in the bottom of the filter housing. It is a wax pellet type T-stat.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

The oil cooler on my car get hot like the upper radiator hose.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Is that part available?

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT