TONS of white smoke at 110 mph...
#1
Super Member
Thread Starter
TONS of white smoke at 110 mph...
Hit a stretch of bridge today and stretch the legs on the car a little...
2014 C63 (completely stock)
48k miles
Current oil: Shell T6 (changed about 1k miles ago)
Was driving for about 25 minutes before this happened, engine was plenty warm... Oil temp at the time was 240F coolant was 197F. I'm in Florida so it regularly gets that hot in the climate with spirited driving. Anyways, was driving in "M" mode went through gears 3 and 4. At about 110 Mph, I noticed a large amount of white smoke coming from the rear. No CEL, everything was running as normal. I pulled off at the next exit (about 2 minutes later) and once I parked, the smoke has stopped. Looked under the hood and everything seemed fine. Once I got home I did notice some type of hot plastic type smell. Definitely not oil as I know that smell. Checked oil/coolant levels and everything is normal.
Drove it to get gas after as I was almost completely out. Started normal, car drove as normal. I got the oil temp up to 245F but could not replicate the problem. Car is still under CPO warranty. Any ideas here?!?!?
2014 C63 (completely stock)
48k miles
Current oil: Shell T6 (changed about 1k miles ago)
Was driving for about 25 minutes before this happened, engine was plenty warm... Oil temp at the time was 240F coolant was 197F. I'm in Florida so it regularly gets that hot in the climate with spirited driving. Anyways, was driving in "M" mode went through gears 3 and 4. At about 110 Mph, I noticed a large amount of white smoke coming from the rear. No CEL, everything was running as normal. I pulled off at the next exit (about 2 minutes later) and once I parked, the smoke has stopped. Looked under the hood and everything seemed fine. Once I got home I did notice some type of hot plastic type smell. Definitely not oil as I know that smell. Checked oil/coolant levels and everything is normal.
Drove it to get gas after as I was almost completely out. Started normal, car drove as normal. I got the oil temp up to 245F but could not replicate the problem. Car is still under CPO warranty. Any ideas here?!?!?
#3
MBWorld Fanatic!
Join Date: Jun 2008
Location: Los Angeles
Posts: 8,044
Received 2,810 Likes
on
1,664 Posts
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Looks like that guy left a trail of oil by the sand truck that followed his line a few min later.
#5
Super Member
Thread Starter
Yea it didn't seem to be coming from the exhaust. I was wondering if it was the trans/rear diff, although it seems to let up once I stopped using the throttle. I'll take the covers off the bottom in the AM and look but I don't think so. I did take it out again and got the temp up to 240F again, which is not hard to do here in FL. No white smoke. If I take it into the dealer what/how much investigating will they do with a CPO warranty?
#6
Super Member
Thread Starter
Yea it didn't seem to be coming from the exhaust. I was wondering if it was the trans/rear diff, although it seemed to let up once I stopped using the throttle. I'll take the covers off the bottom in the AM and look but I don't think so. I did take it out again and got the temp up to 240F again, which is not hard to do here in FL. No white smoke. If I take it into the dealer what/how much investigating will they do with a CPO warranty?
#7
MBWorld Fanatic!
Join Date: Jun 2008
Location: Los Angeles
Posts: 8,044
Received 2,810 Likes
on
1,664 Posts
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
That’s why you get a CPO car. Let the dealer figure it out and don’t take the car back until they do.
Trending Topics
#9
Junior Member
Whats CPO?
That does seem more like coolant although not coming out of the exhaust is still puzzling (thinking block, head cracked), is coolant level still the same? Smell would give it away but hard to do from inside the car.
If the inspection of the bottom of the car doesn't show anything out of place or leaking... Are all the coolant or PVC venting or lines still good? Maybe something from a line dripping on exhaust at temp/speed?
That does seem more like coolant although not coming out of the exhaust is still puzzling (thinking block, head cracked), is coolant level still the same? Smell would give it away but hard to do from inside the car.
If the inspection of the bottom of the car doesn't show anything out of place or leaking... Are all the coolant or PVC venting or lines still good? Maybe something from a line dripping on exhaust at temp/speed?
#10
Senior Member
Whats CPO?
That does seem more like coolant although not coming out of the exhaust is still puzzling (thinking block, head cracked), is coolant level still the same? Smell would give it away but hard to do from inside the car.
If the inspection of the bottom of the car doesn't show anything out of place or leaking... Are all the coolant or PVC venting or lines still good? Maybe something from a line dripping on exhaust at temp/speed?
That does seem more like coolant although not coming out of the exhaust is still puzzling (thinking block, head cracked), is coolant level still the same? Smell would give it away but hard to do from inside the car.
If the inspection of the bottom of the car doesn't show anything out of place or leaking... Are all the coolant or PVC venting or lines still good? Maybe something from a line dripping on exhaust at temp/speed?
The following users liked this post:
skullbox15 (06-06-2018)
#12
Super Member
Thread Starter
M156 transmission fluid leak caused white smoke when fluid his the exhaust pipe.
M156 transmission fluid leak caused white smoke when fluid his the exhaust pipe.
#14
Super Member
Thread Starter
Had it done by an indie shop as part of the 40k service. Is it possible my leaking fluid is radiator coolant? It's green like that, I thought the trans fluid was red? From what I can tell the seal looks fine I didn't check the bolts though.
#15
Member
Same thing happened to me this week. Took my car in for service A at the dealer and they found a “transmission pan” leak which that they had previously serviced. Now my car smokes whenever I push it. 3 weeks out for next appointment. Dealers are rediculous.
-Patel
-Patel
Last edited by Patel; 06-08-2018 at 03:36 PM.
#16
Super Member
I had this happen on my car after some spirited driving.
Turns out the dealer had over filled the transmission. Their was actually a service bulletin about it.
I think the initial service fill level resulted in this venting.
The service bulletin calls for a lower fill amount.
Since the dealer drained my transmission, and refilled correctly, all has been fine.
Turns out the dealer had over filled the transmission. Their was actually a service bulletin about it.
I think the initial service fill level resulted in this venting.
The service bulletin calls for a lower fill amount.
Since the dealer drained my transmission, and refilled correctly, all has been fine.
#17
Member
I had this happen on my car after some spirited driving.
Turns out the dealer had over filled the transmission. Their was actually a service bulletin about it.
I think the initial service fill level resulted in this venting.
The service bulletin calls for a lower fill amount.
Since the dealer drained my transmission, and refilled correctly, all has been fine.
Turns out the dealer had over filled the transmission. Their was actually a service bulletin about it.
I think the initial service fill level resulted in this venting.
The service bulletin calls for a lower fill amount.
Since the dealer drained my transmission, and refilled correctly, all has been fine.
Do you happen to know the bulletin number?
#18
Super Member
#19
Super Member
Thread Starter
I had this happen on my car after some spirited driving.
Turns out the dealer had over filled the transmission. Their was actually a service bulletin about it.
I think the initial service fill level resulted in this venting.
The service bulletin calls for a lower fill amount.
Since the dealer drained my transmission, and refilled correctly, all has been fine.
Turns out the dealer had over filled the transmission. Their was actually a service bulletin about it.
I think the initial service fill level resulted in this venting.
The service bulletin calls for a lower fill amount.
Since the dealer drained my transmission, and refilled correctly, all has been fine.
#20
MBWorld Fanatic!
Join Date: Feb 2010
Posts: 5,491
Received 429 Likes
on
352 Posts
2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
Trans fluid should be red or blue depending on the fluid used. Coolant should be clear or blue. Check your coolant reservoir to see what color fluid is in your cooling system. Sounds and looks like it could be coolant to me.
#21
Member
Just wanted to update you guys the dealer confirmed they over filled the transmission. Cleaned up the car and have it back now and can report no more smoke or smell after spirited drive. Now to get rid of this huge stain on my condo parking spot...
-Patel
-Patel
#22
Super Member
But I must say, it gives you one hell of a fright when you are pushing hard, and suddenly you get this huge cloud behind you. I just about had a heart attack thinking something had blown badly on the motor.
#23
Super Member
Thread Starter
Yea, same thing I thought in the heat of the moment. The dealer checked mine and said same as the other guy that it was overfilled. They did ask me to reproduce as they can't have their techs driving customer cars at 110 Mph. Said they book me another appointment in 2 weeks to recheck.