Oil change tommorrow....
Thread Starter
Member
Joined: Sep 2006
Posts: 237
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From: Los Angeles, CA
G63 W463
Oil change tommorrow....
question for ppl who know....
Im gettng an oil change tommorow due to very hot engine temp
should i stick to mobil 1.....or to royal purple...ive heard good things about rp, but MB recommends Mobil 1.
Suggestions, guidance, anything
thnx in advance
Im gettng an oil change tommorow due to very hot engine temp
should i stick to mobil 1.....or to royal purple...ive heard good things about rp, but MB recommends Mobil 1.
Suggestions, guidance, anything
thnx in advance
Member
Joined: Nov 2006
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From: Gator country
2001 e320 2004 e55
I just had an A service yesterday. The needle still sits right below 80 where it always does in wonderful G-ville traffic. I would get a radiator service if your car is running hot. Stick with M1 5-40.
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Joined: Feb 2007
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From: Western Michigan
2003 E320 4Matic Wagon & 1997 E320
A new one will move the needle above 80 deg C (one needle width above the 80 deg mark) and make it stay there. These thermostats (when new) are rated at 87 deg C and that is what the minimum coolant temp should be after you drive the car a few miles.
This is one of the best $30 maintanance item that is often neglected.
Senior Member
Joined: Feb 2007
Posts: 270
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From: Western Michigan
2003 E320 4Matic Wagon & 1997 E320
Just to add that you might wonder why the thermostats do that.
Over time (after all these heat cycles), the spring weakens so it cannot reach the extreme positions (fully closed and fully open). When it cannot close fully, the coolant cannot reach the designed temp (87 deg). The thermostat is supposed to be in the closed position until the temp reaches 87 deg, then it partially and finally fully opens in trying to keep the temp at 87 deg.
Over time (after all these heat cycles), the spring weakens so it cannot reach the extreme positions (fully closed and fully open). When it cannot close fully, the coolant cannot reach the designed temp (87 deg). The thermostat is supposed to be in the closed position until the temp reaches 87 deg, then it partially and finally fully opens in trying to keep the temp at 87 deg.
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Joined: Mar 2006
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From: West Virginia
2001 E320 RWD - Brilliant Silver/Ash: 100,000+
Maybe what the poster meant was that his oil change is because the hot engine made his motor oil break down? At least that used to be true with the petroleum-based oils, I have never heard if the synthetics react in a similar fashion.
I certainly agree that there is something else going on, and the thermostat is the most likely (and easiest to fix) culprit.
I certainly agree that there is something else going on, and the thermostat is the most likely (and easiest to fix) culprit.
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Thread Starter
Member
Joined: Sep 2006
Posts: 237
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From: Los Angeles, CA
G63 W463
well i meant my temperture, the gauge is suppose to be at 80...but its been lingering toward a 100 regardless of hot/cld days.
i took it in to the mechanic today.
his rookie ended up breaking my oil filter holder thing(s0rry i forgot the name)
now im pissed and i g2 wait till monday for anew one
ahh. all is good though, its still drivable...i love this car.
thnx for ur help guys.
o and my coolant was fine. I checked that.
i took it in to the mechanic today.
his rookie ended up breaking my oil filter holder thing(s0rry i forgot the name)
now im pissed and i g2 wait till monday for anew one
ahh. all is good though, its still drivable...i love this car.
thnx for ur help guys.
o and my coolant was fine. I checked that.
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From: Santa Clarita, CA
1987 E300 TD
Weird thing is....I've had my car running around 90C as well. Since my father has had the car it ALWAYS stayed below the 80C marker, even when traveling through the Mojave Desert w/AC on max.
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Joined: Feb 2007
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E320 1996
No offense but your thermostat needs changing. It is stuck in the partially open position. This happens after the typical 50 - 60k miles. Your engine runs a bit too cool. There is no immediate harm but your gas mileage is slightly lower and the engine is not in optimum running temperature. Over time, then it will not be able to open fully and that will cause overheating of the engine.
A new one will move the needle above 80 deg C (one needle width above the 80 deg mark) and make it stay there. These thermostats (when new) are rated at 87 deg C and that is what the minimum coolant temp should be after you drive the car a few miles.
This is one of the best $30 maintanance item that is often neglected.
A new one will move the needle above 80 deg C (one needle width above the 80 deg mark) and make it stay there. These thermostats (when new) are rated at 87 deg C and that is what the minimum coolant temp should be after you drive the car a few miles.
This is one of the best $30 maintanance item that is often neglected.
Thermostat would only reach 55 max.
I went to the local dealer for the part ,replaced the old one with the new one
lost a little bit of coolant filled it back up.
Temp now sits at the half way mark or higher.
This is a very easy DIY
Last edited by Benzs; Apr 28, 2007 at 07:35 PM.
Senior Member
Joined: Feb 2007
Posts: 270
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From: Western Michigan
2003 E320 4Matic Wagon & 1997 E320
lxl_josh_lxl:
Your E300D uses a lower temp thermostat. It is rated at 80 deg C. So it is normal for it to stay at 80 and occasionally run to 90 etc. As long as it is not in the red zone, there is really no worry unless it is always in the elevated high temperature zones. In a hot summer day with the car stopped, the coling is not going to be very efficient but the diesel should not be generating a lot of heat when idling.
Your E300D uses a lower temp thermostat. It is rated at 80 deg C. So it is normal for it to stay at 80 and occasionally run to 90 etc. As long as it is not in the red zone, there is really no worry unless it is always in the elevated high temperature zones. In a hot summer day with the car stopped, the coling is not going to be very efficient but the diesel should not be generating a lot of heat when idling.
Senior Member
Joined: Feb 2007
Posts: 270
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From: Western Michigan
2003 E320 4Matic Wagon & 1997 E320
Bossman123's thermostat is much lower in position so about 3/4 of a gallon of coolant will be lost in replacement.
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My '96 E320 has been running between 95-98C for years, even after I replaced the thermostat. During winter it floats around 85-88C.
Keep in mind that hotter engine runs better, unless it's over 100C for a long time. Under pressure, your 50/50 coolant won't boil until it reaches around 125C and above... It's all about science
Keep in mind that hotter engine runs better, unless it's over 100C for a long time. Under pressure, your 50/50 coolant won't boil until it reaches around 125C and above... It's all about science
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Joined: Feb 2007
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E320 1996
My '96 E320 has been running between 95-98C for years, even after I replaced the thermostat. During winter it floats around 85-88C.
Keep in mind that hotter engine runs better, unless it's over 100C for a long time. Under pressure, your 50/50 coolant won't boil until it reaches around 125C and above... It's all about science
Keep in mind that hotter engine runs better, unless it's over 100C for a long time. Under pressure, your 50/50 coolant won't boil until it reaches around 125C and above... It's all about science
Thread Starter
Member
Joined: Sep 2006
Posts: 237
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From: Los Angeles, CA
G63 W463
My '96 E320 has been running between 95-98C for years, even after I replaced the thermostat. During winter it floats around 85-88C.
Keep in mind that hotter engine runs better, unless it's over 100C for a long time. Under pressure, your 50/50 coolant won't boil until it reaches around 125C and above... It's all about science
Keep in mind that hotter engine runs better, unless it's over 100C for a long time. Under pressure, your 50/50 coolant won't boil until it reaches around 125C and above... It's all about science
A warmed up engine yes, but its suppose to stay at a moderate temperature, not the hotter the better.
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Joined: Mar 2007
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From: Santa Clarita, CA
1987 E300 TD
lxl_josh_lxl:
Your E300D uses a lower temp thermostat. It is rated at 80 deg C. So it is normal for it to stay at 80 and occasionally run to 90 etc. As long as it is not in the red zone, there is really no worry unless it is always in the elevated high temperature zones. In a hot summer day with the car stopped, the coling is not going to be very efficient but the diesel should not be generating a lot of heat when idling.
Your E300D uses a lower temp thermostat. It is rated at 80 deg C. So it is normal for it to stay at 80 and occasionally run to 90 etc. As long as it is not in the red zone, there is really no worry unless it is always in the elevated high temperature zones. In a hot summer day with the car stopped, the coling is not going to be very efficient but the diesel should not be generating a lot of heat when idling.
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Joined: Feb 2007
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E320 1996
When mine was going it was doing some weird stuff before I figured it out.
