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Old 09-25-2013, 12:48 PM   #1
two_sl2s
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Default '96 SL2 1.9 DOHC Oil in Coolant

This was one of the OH #&@* moments. My wife called to say the car was overheating. She thought there was antifreeze in the trunk, so when she got out of her doctors appointment, she added some .... oil .... I only found out when I noticed a foamy substance under the car.
Anyway that was a couple of months ago. I did my best to flush the system. I did several altering applications of plain water and water with dawn dish soap. I thought that I had gotten all of the oil, but the other day when I added some coolant, I noticed foam on top of the coolant again. Not much, but neverless foam from the oil.
I also noticed this morning that the heater isn't putting out near as much heat as it did previously. I suspect that the heater core is at least partially plugged.
My first thought is to drain the coolant, disconnect both lines to the heater core and back flush with water.
Any ideas on how to get the rest of the oil out of the system? Or other ideas to flush the heater core?

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Old 09-25-2013, 02:02 PM   #2
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1995 SL1
Default Re: '96 SL2 1.9 DOHC Oil in Coolant

Back flushing the core is probably the best bet. As far as what removes the rest of it the best... sort of a crap shoot really. One of the ready made flushes might work well, but hard to tell what would cut through the oil well and not be too caustic as the same time.

At least you know why it is there. When I saw the thread title I thought you would be in need of a head gasket.

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Old 09-25-2013, 05:27 PM   #3
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Default Re: '96 SL2 1.9 DOHC Oil in Coolant

Flush with hot water and TSP. Use a couple tablespoons of TSP and let the engine sit and idle until the thermostat opens. It wil boil over so shut it off as soon as the gauge reaches 1/2 or a bit before. Let it sit and cool and then start it up again and heat up. Do this 3 to 4 times and drain. TSP, trisodium phosphate, can be found in the paint section of t4h big box store or Amazon. This stuff: http://www.amazon.com/Savogran-10621.../dp/B0001GOGQW

Home Depot sells it.


Quote:
Originally Posted by two_sl2s View Post
This was one of the OH #&@* moments. My wife called to say the car was overheating. She thought there was antifreeze in the trunk, so when she got out of her doctors appointment, she added some .... oil .... I only found out when I noticed a foamy substance under the car.
Anyway that was a couple of months ago. I did my best to flush the system. I did several altering applications of plain water and water with dawn dish soap. I thought that I had gotten all of the oil, but the other day when I added some coolant, I noticed foam on top of the coolant again. Not much, but neverless foam from the oil.
I also noticed this morning that the heater isn't putting out near as much heat as it did previously. I suspect that the heater core is at least partially plugged.
My first thought is to drain the coolant, disconnect both lines to the heater core and back flush with water.
Any ideas on how to get the rest of the oil out of the system? Or other ideas to flush the heater core?

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Old 09-26-2013, 01:05 PM   #4
two_sl2s
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1996 SL2
Default Re: '96 SL2 1.9 DOHC Oil in Coolant

Thanks for the suggestion of TSP. I actually have a bottle of liquid I bought to wash the wall in prep for painting. At least I am pretty sure it is TSP. Anyway, since it is a liquid, I am sure the mixture would be a bit different.

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Old 09-26-2013, 01:43 PM   #5
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1998 SC2
Default Re: '96 SL2 1.9 DOHC Oil in Coolant

Verify that it is actually TSP and if so dump in a bunch and let it clean up the mess.

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