Cabot

Hi. I was wondering what the normal oil temperature and pressure is. While driving my V8 at 40 or above, the oil pressure is usually at the top 45PSI and the temp is at 174 or just below. However, at 75 on the highway, the temperature is slightly above 175, the Red Zone I believe is 245. Is around 185 a dangerous temperature?

Messerchmidt

check your fan bearing, yes thats not very safe. also check your coolent

next oil change, toss ina bottle of Lucas heavy oil stabalizer, that should help

abe g

I run a 450sl 1977 and on a farenheit guage, I run from 175 to 200 plus on a hot or short run. Allowing for variations in guage readings, It appears there is nothing wrong withyour running temp! Some thermostats are set at 185 ! The manual states runs up to red line are not unusual (on hot days and acc on) So dont worry, and dont be mislead into expensive and un necessary repairs. good luck, Abe G

SouthernSon

Here is the way I understand it: condensation forms in the crankcase each time you run the vehicle. We have all heard that it is best to run a car atleast 20 to 30 minutes after reaching temperature as opposed to short little 5 minute hops. The short runs never allow the condensation to evaporate out of the oil (thus - rust/acid). Oil NEEDS to get to 212F from time to time. At the track, my vette has reached 260.

So, get it hot but use a good synthetic and one that does not cover a wide range of grades (such as 10-50). A good 10-30 or 20-40 is better because less modifiers (viscosity improvers) are used to reach the span of grades. Viscosity improvers do not contribute to lubricity and they 'coke out' quicker in extreme temperatures. That is bad.

The above is to what it all basically boils down! (pun intended)

krigsmakten

I have another problem - the oil doesn't get warm enough. Does anyone have access to an image of the oiling system for the M117? An image that includes the internal oil lines, with oil cooler, any bypass valves or thermostats etc.

abiby

Uhhh.... Why do you think your oil isn't warm enough? The only temperature gauge my SLs have is for coolant.

krigsmakten

I don't think it isn't warm enough - I know it isn't.

We're not dealing with a stock vehicle here - this one has twin turbos, so the oiling system is a bit modified. That's why I'm curious to hear if anyone has any detailed insights into the layout - specifically how the switch btw the oil cooler circuit and the internal loop works.

Does the "flow regulator" device contain a bimetal-operated spring for example - or is it dependent on some level of flow restriction to operate properly? If you remove the "flow regulator" - does that deactivate the oil cooler circuit?

abiby

That's out of my knowledge base.

However, IIRC, there's an oil flow schematic in the cd service manual...
Sadly it may be too generic to be helpful.

WHTEVO

So what actual temp is your oil getting to? I watch and log oil temps in my Evo, and also have a OEM readout in my SL65. Since this is a MB forum, my SL regularly reads between 80C-100C while driving. Sometimes a tad higher if i am actually doing some extended periods of wide open throttle pulls. The oil temp "warning" indicator does not stop blinking until the temp reaches at least 80C. Now in other cars i have messed with, there is a oil "tstat" in the oil filter housing which determines when oil starts to flow through the oil cooler. Alot of people will remove this to keep oil temps lower and to constantly flow through the cooler. It could be possible that yours is stuck open. What's your coolant temps? Good luck.

Aaron

kenster96

Getting 220 degrees Fahrenheit normally, from hard driving I get 230- 240 degrees fahrenheit in just regular 60 - 80 degree weather. I'm not sure if my oil is overfilled or what. I've been watching it for the past couple of weeks and it seems to always be that high. Any suggestions?