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#1 |
Registered User
Join Date: May 2004
Posts: 61
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Milky oil on the dipstick. Head gasket?
Once upon a time I had milky oil on the dipstick in another engine. My original 292 six now has this problem. It still runs strong, and doesn't smoke.
Thoughts please? Thanks...
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'74 GMC SIERRA 1500 '70 C-10 "FARMER'S SPECIAL" |
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#2 |
Registered User
Join Date: Apr 2004
Location: South Texas....the Valley
Posts: 199
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Do a cooling system pressure check. This will tell you if you have a coolant to leak. Often times in colder weather I'll get a little "milky" appearance on the dipstick or oil filler cap. It may just be cool-weather condensation.
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#3 | |
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Join Date: May 2004
Posts: 61
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...
Quote:
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'74 GMC SIERRA 1500 '70 C-10 "FARMER'S SPECIAL" |
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#4 |
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![]() Join Date: Jul 2003
Location: LeRoy, Mich.
Posts: 854
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I would be willing t bet that its your oil weight. Heavier or thicker oils can not rid of the moisture as easily. Like a 30W vs. a 10w 30, that 30w will retain the moisture a whole lot longer vs 10w 30 for example. This is because of the colder weather that your motor is now exposed to. I have seen this alot. This may not be your case for sure, but I think its your oil.
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#5 | |
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Join Date: May 2004
Posts: 61
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Quote:
![]() I just switched to 20/50 weight not long ago to quiet some of the tappity tap that's so common with these 292's. I used to go with a lighter weight in cold weather and that just may be the issue. It's all coming back to me now, as I haven't been a motorhead for too many years. I'll check that first. Thanks for the reply....
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'74 GMC SIERRA 1500 '70 C-10 "FARMER'S SPECIAL" |
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#6 |
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Location: LeRoy, Mich.
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20/50, yea I bet thats the problem. I'd run 10w/30 or 10w/40 myself.
Bowtiefreak
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1968 Chevy C10 Short Fleetside/Wood floor ECE 4-6 Drop / 406 Small Block 1971 Chevelle 427 Big Block |
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#7 | |
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Join Date: May 2004
Posts: 61
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Quote:
Thanks...
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'74 GMC SIERRA 1500 '70 C-10 "FARMER'S SPECIAL" |
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#8 |
Registered User
Join Date: Mar 2004
Location: Gibsonville, NC
Posts: 42
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Your engine is not breathing like it should. I had the same problem and took my wife's car to my MOPAR mechanic, and he replaced the PCV valve and the oil breather cap and got the thing breathing again and the problem went away. Keep the moisture inside the oil area and you will get the milky look on your dipstick.
~ Don ~
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#9 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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i agree with don check your pcv. also pull the valvecover that will tell the story if it is caused by condensation there will be white colored sludge on the underside of the valve cover
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#10 | |
Registered User
Join Date: May 2004
Posts: 61
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Quote:
I replaced the PCV a few thousand miles ago, but I suppose it's possible I bought a bad valve. I'll throw another one in when I change over to lighter oil....just to be sure. Thanks....
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#11 |
My other Love
Join Date: Aug 2001
Location: Castlegar B.C. Canada
Posts: 4,085
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also check if you crankcase filter is plugged, (slim chance though)
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#12 | |
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Join Date: Mar 2004
Location: Gibsonville, NC
Posts: 42
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Quote:
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#13 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Have you been losing any coolant? If not, it is probably a condensation issue. I agree, check the pcv system. What happens is when the engine cools off, the moisture collects on the inside metal surfaces. Another cause for this is short trip driving. The engine needs to get hot enough to boil the water out of the oil, it then depends on the pcv system to suck the worst of the moisture out.
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