Synthentic oil and water mix when gasket blows?

Synthentic oil and water mix when gasket blows?

Postby Spider'sSafari [OP] » January 10th 2013, 6:27pm

I've looked all over the web and no one has a good answer to
WHAT HAPPENS TO FULL SYNTHENTIC OIL WHEN WATER IS MIXED IN UNDER HEAT?

What happened was my wifes daily driver is a GMC Denali w/5.7L and I have never had any problems in 190K miles that are on it. I've only had to replace the water pump 5 yrs ago and That's IT! other then that just regular service and I have been running FULL Synthentic for the last 3 yrs and changing it about every 9K miles. It's just used local store to store runs or dinner out, Being in the South she idles it more them I'd like with the A/C on during the summer month. Well last week (cold here) she went out and started it to warm it up, ran 15 min or so then she left, before she got to the end of the street it overheated and she came back home.
I went out to check coolant and EMPTY, put some coolant in it and down it went, Looked underneath and NO leaks, pulled oil stick and there it was Brown Milkshake!

Most common w/5.7L was Intake gasket, So I tore it down and YES, Left side at #2 cyl, the gasket was Blown!

Here's the Million $$$$ ??????? I drained the pan and the Synthentic Oil / Water Combo has been seating for a week and still has not seperated in the jug.
?? Does the synthentic oil Incapsulate the water?
Blend with it on a certian Parts per Million factor ? > that being more oil / less water in PPM's?
The mix was probably about 5 qts oil & 1.5 Gal coolant, 5 gal contaner and it was half full, so around 50/50 mix.
The better of 2 evils, the synthentic oil seemed to hold it's lube properties well and when I cleaned the inside of the engine block, the milkshake cleaned up easy with Kerosene spread on parts with a paint brush and poured down oil ports.
I don't have it back together yet and all other engine checks are fine, so I don't except any other problems. I feel like if this happens the better of 2 evils is Synthentic Oil will protect the engine better then Regular oil.
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Re: Synthentic oil and water mix when gasket blows?

Postby DRZ » January 10th 2013, 7:22pm

A good synthetic is better hot or cold than the best dinosaur guts but I can't recall any test at all about when saturated with coolant. As that is a very real possibility in the real world someone should look into that but I sure can't answer your question.
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Re: Synthentic oil and water mix when gasket blows?

Postby Don1806 » January 10th 2013, 7:28pm

I was using Amsoil when my intake gasket went on the Astro a few years ago. Had the brown milkshake as well. Had the engine rebuilt - the Amsoil apparently made no difference in protecting the engine. The rebuilt engine blew in 1500 miles. Since it was rebuilt by a machine shop locally, I can't say what the issue was other than several people telling me that once antifreeze gets in the engine - get rid of it, don't rebuild it - turns out that they were right in this case.

I then had a GM rebuilt crate engine put in - no problems and the van is still going strong 5 years later.

Good luck!
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New Engine at 140,000 miles due to intake gasket failure. Hoping to at least double that.
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Re: Synthentic oil and water mix when gasket blows?

Postby DRZ » January 11th 2013, 5:37pm

a Billzillion people could tell you to never rebuild an engine after anti-freeze gets in it and that still wouldn't make it true. You sure are pushing your luck running an engine after anti-freeze gets into the oil WITHOUT rebuilding it. Whatever happened to your rebuilt engine was somebodys mistake but wouldn't have had anything to do with anti-freeze being in the oil at some point in time.
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Re: Synthentic oil and water mix when gasket blows?

Postby Spider'sSafari [OP] » January 13th 2013, 5:46pm

Well the engine is all back together and No leaks. It seems to be running fine with good oil pressure and staying cool. I've only driven it around local starting off slow and keeping the rpm's low. I have noticed a little lifter noise when I lift off the Rev's, I thinks it's because the lifters were flused out real good and will take some time to get pumped back up.
I am running a thick oil mix of Lucas oil treatment and 10/40 Castrol oil in a 50/50 mix of quanity AND it is Not Synthentic type. Since I had done several quick fluses and used Kerosene to make sure all the coolant was out AND maybe if it was going to blow again or the motor was trashed, I would just run Dino oil in it and see what happens.
I'll just keep checking fluids and running it easy until I get the warm n fuzzies about it being OK, Now my wife says it's time for a new one or Start driving her Dodge Daytona full time, But I say it's time for her to drive the Safari on her outtings, that difinitely couldn't hurt it!

Daytona or Safari ?
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Re: Synthentic oil and water mix when gasket blows?

Postby redfury » January 13th 2013, 7:19pm

I would change the oil again ASAP just to help flush out anything that got mixed in that didn't get cleaned out with your Kerosene flush and run some more dino oil in it. Likely the lifters are making noise because they got contaminated with antifreeze. They should have been pulled and cleaned and re-oiled before the motor went back together, but hindsight.....Hopefully a few quick oil changes will get them bolstered back up with oil and the noise will go away. Hate to have them pounding the cam lobes down and ruin performance.
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Re: Synthentic oil and water mix when gasket blows?

Postby cowboydan » January 14th 2013, 5:46pm

DRZ wrote:a Billzillion people could tell you to never rebuild an engine after anti-freeze gets in it and that still wouldn't make it true. You sure are pushing your luck running an engine after anti-freeze gets into the oil WITHOUT rebuilding it. Whatever happened to your rebuilt engine was somebodys mistake but wouldn't have had anything to do with anti-freeze being in the oil at some point in time.

i agree, but for another reason. the reason most likely imo would be an over heated factor. the heat will warp most any mating surface. it's been known to cause thrown pushrods, bent rocker arms, spun bearings, cam dammage, and if the machinest says that "ohh gosh the heads can be remachined or "decked", i would get another opinion. overheating causes lots of micro cracks. so i wouldn't blame the coolant for the rest of that true statement, i would blame the latter effect of mixing coolant causing the an over heating condition.

my other opinion about syn oil and water would be that is totally possible have the 2 emulsify. the reason is in the detergents and additives. the water is still present but at a melecular level. the oil will surround the water keeping corrosion to a minimum. kind of what dish soap and water do to oil. it cuts the grease from the pan and still allows you to keep cleaning dishes with the same dish water. same principal but reverse. the dishsoap and water solution still emulsifies oil
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Re: Synthentic oil and water mix when gasket blows?

Postby Spider'sSafari [OP] » January 26th 2013, 5:51pm

So far all good with the Yukon, No fluid mix ups and still Clean oil. The coolant had to be flushed again, but since last week no more problems. With the weahter taking a turn for the worse in TN. I was glad she could drive the Yukon and keep the Daytona parked in the garage. For her there's a pecking order of what she drives first n last and she hates the Safari, so she'll drive my daily/work van Chrysler first before it, then the Daytona only if the weather is clear. Weather bad she loves the Yukon!
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