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Does anyone know what temperature the oil cooler thermostat is supposed to open?? also what oil temp is everyone's gauge indicating???
 

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In normal driving, once warm, mine sits at about 98-99 Celsius. This is just left of centre. After a 'spirited drive', it might go up to 102-3. This is just right of centre.

Can't answer the other part of your question.

Cheers
 

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I know that the main coolant thermostat is a common failure on these cars. Curious what the durability is of the oil thermostat. Do they cause low oil temperature? Is there a code for it if the oil temperature is increasing too slow?
 

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Under a normal / recommended ,warm up drive’ before
even thinking of goingbeyond 3500 rpm (!) it takes
appr. (outdoor temperature depending) a 15 minutes
relaxed drive before the oil temp. reaches 80 degrees
(Celsius) until finally balancing out at 90 degrees and
stays there. Spirited drive, higher speed, increased engine
rpm under acceleration will increase oil temp and the oil thermostat will open at appr. 104 degrees (Celsius)
and consequently oil temp will drop considerably before
balancing out again at about 90 degrees (Celsius) or
higher in case of continued high rpm and spirited drive
or longer time of high speed, like on a distant travel on
parts of a BAB in Germany without speed limits.
The oil thermostat is an integrated part of the oil filter
housing and NOT mechanical.
(courtesy of various knowledgable S38 contacts in the community).
 

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I know that the main coolant thermostat is a common failure on these cars.
What is your source on this? Im not familiar with the coolant thermostat being a "common failure" point on any version of the M88/S38 beyond regular maintenance intervals.
 

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@de Witt - long time, no hear > still going strong as it seems ? 😉👍
take care ! and best wishes in these difficult times......😀
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on the subject > I agree with your input👍😉 the coolant thermostat should normally NOT be of a specific concern, whereas instead the waterpump is a subject of concern
and should be checked regularly and is recommended to
be replaced in 80.000 km intervals
(recommendation only to avoid failure at the wrong time
and place in high speed). 😟😉
 

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@de Witt - long time, no hear > still going strong as it seems ? 😉👍
take care ! and best wishes in these difficult times......😀
-
on the subject > I agree with your input👍😉 the coolant thermostat should normally NOT be of a specific concern, whereas instead the waterpump is a subject of concern
and should be checked regularly and is recommended to
be replaced in 80.000 km intervals
(recommendation only to avoid failure at the wrong time
and place in high speed). 😟😉
Karl,

Thanks for the wishes my friend, things are good, a few new M5s, a few that have moved on to capable hands, my best to you and yours.

100% agree on the water pump, the original design was fault prone, though the updated design allows for long maintenance intervals.

On the oil cooler thermostat, Ive never inspected it . . . if it goes out I would just replace with an OEM part or find an aftermarket item that would work. They seem quite robust.
 
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