M113K Oil Temperature - too low???
Thread Starter
Junior Member
Joined: Oct 2019
Posts: 23
Likes: 2
1987 W126 560SEC
M113K Oil Temperature - too low???
Hi All,
I have swapped an M113K from an S55 into a 560SEC. My engine oil temp is always 15 to 20 degrees Celsius lower than the coolant temp which ranges from 83 to 90. So mostly my oil temp is around 65 to 75. This has been confirmed with my oil temperature gauge installed in the vehicle as well as heat gun reading on the oil pan. From my experience this seems to low, am I correct? Possible to have a faulty oil thermostat? The engine sat for a couple of years while the swap took place. I have an aftermarket oil cooler but that should be irrelevant with the factory thermostat. Cheers
I have swapped an M113K from an S55 into a 560SEC. My engine oil temp is always 15 to 20 degrees Celsius lower than the coolant temp which ranges from 83 to 90. So mostly my oil temp is around 65 to 75. This has been confirmed with my oil temperature gauge installed in the vehicle as well as heat gun reading on the oil pan. From my experience this seems to low, am I correct? Possible to have a faulty oil thermostat? The engine sat for a couple of years while the swap took place. I have an aftermarket oil cooler but that should be irrelevant with the factory thermostat. Cheers
MBWorld Fanatic!
Joined: Jan 2011
Posts: 2,159
Likes: 160
2006 E55
I'd definitely start with the oil thermostat. On this car and many other makes I've owned, this is especially common on water temp thermostat (especially after 15+ years of usage) staying stuck open and never getting to optimal operating temperature.
Best of Luck
Best of Luck
Newbie
Joined: Jul 2015
Posts: 9
Likes: 2
W220 S500L
Oil Thermostat Location
Hi All,
I have swapped an M113K from an S55 into a 560SEC. My engine oil temp is always 15 to 20 degrees Celsius lower than the coolant temp which ranges from 83 to 90. So mostly my oil temp is around 65 to 75. This has been confirmed with my oil temperature gauge installed in the vehicle as well as heat gun reading on the oil pan. From my experience this seems to low, am I correct? Possible to have a faulty oil thermostat? The engine sat for a couple of years while the swap took place. I have an aftermarket oil cooler but that should be irrelevant with the factory thermostat. Cheers
I have swapped an M113K from an S55 into a 560SEC. My engine oil temp is always 15 to 20 degrees Celsius lower than the coolant temp which ranges from 83 to 90. So mostly my oil temp is around 65 to 75. This has been confirmed with my oil temperature gauge installed in the vehicle as well as heat gun reading on the oil pan. From my experience this seems to low, am I correct? Possible to have a faulty oil thermostat? The engine sat for a couple of years while the swap took place. I have an aftermarket oil cooler but that should be irrelevant with the factory thermostat. Cheers
Curious to know the location of the oil thermostat .., I also did M113k swap into W220 S500 and just connected the oil in/out lets directly to remote oil cooler...my oil temps remain close to coolant temps 85-95C ....I think may the factory oil coolers had temp sensors on them are they same thing a oil thermostat ( my limited knowledge has a thermostat that has some mechanical function to open / close based on different circumstances including temperatures.
Thread Starter
Junior Member
Joined: Oct 2019
Posts: 23
Likes: 2
1987 W126 560SEC
Curious to know the location of the oil thermostat .., I also did M113k swap into W220 S500 and just connected the oil in/out lets directly to remote oil cooler...my oil temps remain close to coolant temps 85-95C ....I think may the factory oil coolers had temp sensors on them are they same thing a oil thermostat ( my limited knowledge has a thermostat that has some mechanical function to open / close based on different circumstances including temperatures.
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