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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 12-13-2003, 03:56 PM   #1
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Default Yellow residue on bottom of oil filler cap?

Hey guys i took of my oil filler cap to add a little oil today and on the bottom of the cap there was alot of this yellow residue (it was also all in the plastic piece that attaces to the valve cover. waht is this stuff and waht does that mean?

Also when im on the parkway i have a rattle or some **** coming from underneath the passenger side floorboard right near the hump in the floorboard. anyone know what that could be.. also my subframe connecters arent in but when i put them in will it take care of it ?
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Old 12-13-2003, 04:05 PM   #2
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If i'm not mistaken, it could be water/antifreeze in your oil which is a very bad thing. I've seen that alot on Diesel engines with alot of miles on them. I'd diffently go to the dealership and have them check it out. Head gasket is likely gone if it's true
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Old 12-13-2003, 04:12 PM   #3
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It's normal condensation that occurs in the crankcase.
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Old 12-13-2003, 04:12 PM   #4
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Watch your antifreze level over the next few days. And dont run the car high RPM's. Coolent in the oil will create a foamy substance on your oil cap. You wont be able to tell by draining the oil. I had this problem on my Iroc and the only 2 sighns are the oil filler cap stuff and loss of coolant.
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Old 12-13-2003, 04:18 PM   #5
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sounds like condensation.......it does happen naturally at times but like others said, keep a watch on your water level.....if it starts to fall, suspect problems.
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Old 12-13-2003, 06:10 PM   #6
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really... thats not good... ill check my coolant level. but keep in mind the car only has 29,980 miles on it. i dont think a headgasket can go that soon.. but ill keep an eye on it. would a metco breather take care of the condensation in the crankcase?
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Old 12-13-2003, 06:21 PM   #7
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Someone was saying if my headgasket was gone, i would be idling crappy and my car would be running a little hotter... the car is idling fine and driving fine, not consuming anymore oil than usual and running as cool as it ever did with the thermostat i put in.. also at last oil change i added lucas stabilizer could that be some of the problem?
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Old 12-13-2003, 06:32 PM   #8
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See if you can find an LS1 that does not have something similar there. It is very normal and is no reason to look for coolant loss.
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Old 12-13-2003, 06:39 PM   #9
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I would check the coolant level as stated above but I wouldn't get to spun up. It sounds like condensation to me and is very normal.

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Old 12-13-2003, 06:39 PM   #10
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thanks man i was getting worried... im 17 years old and have no money to be putting a new headgasket in
ill check the coolant and get back to you guys
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Old 12-13-2003, 07:00 PM   #11
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Okay guys i checked the raditor, it was full and the proper color, pretty clean and everything, then i checkd the resivior, it was reall low but that could have been from when i put the thermostat in i didnt add enough, i looked under the oil cap and saw that it is yellow residue and some moisture.. any got any ideas of waht i should do now?
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Old 12-13-2003, 08:11 PM   #12
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"wont be able to tell by draining the oil"
If you have ever changed the oil on a car with an internal head gasket leak you can tell in the oil, oil and water dont mix well.

Let the car sit for a while (few hours) then change your oil if you are worried, watch the oil come out if it comes out looking like either A. water or B. a milkshake then you have problems. Yes headgaskets can go with 30k on them. But I wouldnt worry much thats normal on most cars, condensation isnt going to hurt anything.
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Old 12-13-2003, 09:02 PM   #13
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This sounds like normal condensation to me.
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Old 12-14-2003, 01:40 AM   #14
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My car has the same yellowness under the filler cap. I think its just condensation. I didnt have it earlier in the year when it was warmer. It just started showing up when it got cold. Im sure its just condensation. Check your coolant, if its ok, i wouldnt worry any further.
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Old 12-14-2003, 08:26 AM   #15
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My bug does that..
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Old 12-14-2003, 08:36 AM   #16
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i had that junk on my oil filler cap once in between changes.it didnt run hotter or run poorly.i make alot of short trips and told thats what causes this.unless theres other symptoms along with this i wouldnt be concerned.
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