Antifreeze in oil? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1968CHEVYC10 · 01-24-2011, 02:14 PM

Over the last month when I check my oil, I've been noticing some light gray slimy stuff on the dipstick, also about a month ago I changed out my thermostat, and since then there's been a small leak around there, you can see a small puddle of antifreeze on the intake manifold every now and then. So I just got to thinking, could antifreeze be getting into the oil and that account for the gray slime on the dipstick?

**Clyde65** · 01-24-2011, 02:25 PM

Yes and I wouldnt drive it much if at all, the antifreeze will ruin your oil and hinder what it is there for. I would fix the thermo housing and then change oil, run for a little bit and change the oil again.

71swb4x4 · 01-24-2011, 02:36 PM

More than likely the gray slime is just condensation. Here is South Dakota we get that for a solid for four or five months when it's really cold. In Texas it probably rarely gets cold enough to see it, so that's why it's alarming to you.

Now if all of the oil on the dipstick is the gray stuff, you have a problem. If you are worried just drain the oil. If the oil looks normal it's probably just condensation.

longhorn396 · 01-24-2011, 02:47 PM

Headgasket? maybe??

matthew20061 · 01-24-2011, 02:50 PM

When you get antifreeze in the oil it will most likely start smoking white and smell like burning antifreeze.
Posted via Mobile Device

*Shane* · 01-24-2011, 02:51 PM

a leaking intake manifold gasket will also allow water to get in the oil ...

treveiger · 01-24-2011, 03:09 PM

Quote:

Originally Posted by 71swb4x4

More than likely the gray slime is just condensation. Here is South Dakota we get that for a solid for four or five months when it's really cold. In Texas it probably rarely gets cold enough to see it, so that's why it's alarming to you.

Now if all of the oil on the dipstick is the gray stuff, you have a problem. If you are worried just drain the oil. If the oil looks normal it's probably just condensation.

Lol i noticed that a few weeks ago, wondered what it was but didnt think much of it. Thanks!

big_al_71 · 01-24-2011, 03:16 PM

In miami I would think either a blown head gasket or a leaking intake manifold gasket...As already suggested drain the oil and see what it looks like..

GASoline71 · 01-24-2011, 03:26 PM

Quote:

Originally Posted by matthew20061

When you get antifreeze in the oil it will most likely start smoking white and smell like burning antifreeze.
Posted via Mobile Device

That will happen when water/antifreeze gets into the cylinder... not the crankcase.

Gary

1968CHEVYC10 · 01-24-2011, 04:09 PM

Wow thanks for the help y'all, not sure if it makes a difference but thought I'd mention, the oil on the dipstick was always clean, the slime was usually further up towards the top of the dipstick. I do plan on fixing the leak soon no matter what the slime is.

matthew20061 · 01-24-2011, 04:42 PM

Quote:

Originally Posted by GASoline71

That will happen when water/antifreeze gets into the cylinder... not the crankcase.

Gary

Your right I don't know what I was thinking, I bought a 96 gmc once with blown head gaskets and it was smoking like crazy because of the coolant getting into the cylinders and leaking intake gasket. I checked the oil and the engine was literally half full of coolant probably around a gallon of antifreeze mixed with oil. Rebuilt the heads, new head gaskets, and intake gaskets and it ran perfect. It was my first truck and I drove it for two years with no issues.

57larry · 01-24-2011, 05:45 PM

I'm thinking headgasket

1968CHEVYC10 · 01-24-2011, 10:25 PM

I take back what I said about the oil being clean, just checked it...

it wasn't clean. Oh well anyway got a new gasket and thermostat (it wasn't running hot enough with the 180deg I put in last time) so tomorrow I'll get the leak fixed and changed the oil. If there are some problems with the other gaskets ie. intake and head, then hopefully it'll be ok till I can get my new motor swapped in. Thanks for the help y'all!

sjarrett71 · 01-24-2011, 11:28 PM

I've never known a thermostat gasket to let antifreeze into the crankcase. I think you have other issues.
Posted via Mobile Device

**special-K** · 01-25-2011, 11:49 AM

The t-stat gasket leak is unrelated. It just started leaking because you didn't get it sealed well. That's external. It will be one of the problems already mentions and you should not drive it or you'll need main bearings,etc. Check for bubbling water in your radiator.

01-24-2011, 02:14 PM	#1
1968CHEVYC10 Registered User Join Date: Aug 2009 Location: Tomball, TX Posts: 578	Antifreeze in oil? Over the last month when I check my oil, I've been noticing some light gray slimy stuff on the dipstick, also about a month ago I changed out my thermostat, and since then there's been a small leak around there, you can see a small puddle of antifreeze on the intake manifold every now and then. So I just got to thinking, could antifreeze be getting into the oil and that account for the gray slime on the dipstick? __________________ '68 C10 LWB 6.2NA/NP833 3.73's

01-24-2011, 02:25 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Antifreeze in oil? Yes and I wouldnt drive it much if at all, the antifreeze will ruin your oil and hinder what it is there for. I would fix the thermo housing and then change oil, run for a little bit and change the oil again. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

01-24-2011, 02:36 PM	#3
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Antifreeze in oil? More than likely the gray slime is just condensation. Here is South Dakota we get that for a solid for four or five months when it's really cold. In Texas it probably rarely gets cold enough to see it, so that's why it's alarming to you. Now if all of the oil on the dipstick is the gray stuff, you have a problem. If you are worried just drain the oil. If the oil looks normal it's probably just condensation. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

01-24-2011, 02:47 PM	#4
longhorn396 S.D.M.F. Join Date: Jan 2007 Location: Westport, In Posts: 639	Re: Antifreeze in oil? Headgasket? maybe?? __________________ 1969 Chevy Longhorn 396/400 3/4 ton. 1991 Chevy Camaro RS 305/700r4 1978 Honda XL175 and XL350(the evil twin) 2006 Kawasaki ZX-14r drag bike-best e.t. 9.4@145 mph without nitrous 1971 BSA Thunderbolt 650cc

01-24-2011, 02:50 PM	#5
matthew20061 69' Chevy Stepside Join Date: Mar 2008 Location: Anchorage, Ak Posts: 526	Re: Antifreeze in oil? When you get antifreeze in the oil it will most likely start smoking white and smell like burning antifreeze. Posted via Mobile Device __________________ -Matthew -69' Chevy Custom/10 Shortbed Stepside 2WD "Copperhead" - Restored, 6.0L LQ9 Built. L92 Heads and LS3 Intake with Comp Cam 223/231 .610/.617 112 LSA, 4L60E with Shift Kit and Circle-D 3200 Stall Converter ~Build Thread -1957 Chevy BelAir 2 Door Post Sedan, Full Frame off Restoration done myself - 6.0L with T56 six speed -1957 Chevy BelAir 2 Door Post Sedan - Nearly rust free AK car, Project in the waiting -2003' Chevy Silverado SS AWD 6.0L! - Daily Driver

01-24-2011, 02:51 PM	#6
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: Antifreeze in oil? a leaking intake manifold gasket will also allow water to get in the oil ...

01-24-2011, 03:16 PM	#8
big_al_71 Registered User Join Date: Jun 2008 Location: South Florida Posts: 11,375	Re: Antifreeze in oil? In miami I would think either a blown head gasket or a leaking intake manifold gasket...As already suggested drain the oil and see what it looks like.. __________________ Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild

01-24-2011, 04:09 PM	#10
1968CHEVYC10 Registered User Join Date: Aug 2009 Location: Tomball, TX Posts: 578	Re: Antifreeze in oil? Wow thanks for the help y'all, not sure if it makes a difference but thought I'd mention, the oil on the dipstick was always clean, the slime was usually further up towards the top of the dipstick. I do plan on fixing the leak soon no matter what the slime is. __________________ '68 C10 LWB 6.2NA/NP833 3.73's

01-24-2011, 05:45 PM	#12
57larry Registered User Join Date: Nov 2007 Location: Indianapolis Posts: 1,161	Re: Antifreeze in oil? I'm thinking headgasket

01-24-2011, 10:25 PM	#13
1968CHEVYC10 Registered User Join Date: Aug 2009 Location: Tomball, TX Posts: 578	Re: Antifreeze in oil? I take back what I said about the oil being clean, just checked it... it wasn't clean. Oh well anyway got a new gasket and thermostat (it wasn't running hot enough with the 180deg I put in last time) so tomorrow I'll get the leak fixed and changed the oil. If there are some problems with the other gaskets ie. intake and head, then hopefully it'll be ok till I can get my new motor swapped in. Thanks for the help y'all! __________________ '68 C10 LWB 6.2NA/NP833 3.73's

01-24-2011, 11:28 PM	#14
sjarrett71 Registered User Join Date: Dec 2006 Location: Rolla, MO Posts: 2,463	Re: Antifreeze in oil? I've never known a thermostat gasket to let antifreeze into the crankcase. I think you have other issues. Posted via Mobile Device __________________ -Scott-

01-25-2011, 11:49 AM	#15
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Antifreeze in oil? The t-stat gasket leak is unrelated. It just started leaking because you didn't get it sealed well. That's external. It will be one of the problems already mentions and you should not drive it or you'll need main bearings,etc. Check for bubbling water in your radiator. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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