Oil keeps getting Thin
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Elder User
Joined: Apr 2002
Posts: 533
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From: Texas
Oil keeps getting Thin
Hello! I seem to have a problem with my 460, the Oil is getting thinner and thinner i've done two oil changes on it and with in about few days of driving the Oil runs off the dipstick like water when its cold running 15w50 and the oil pressure is maxing out, I've never come across some thing like this, I cant smell gas in the oil and the oil won't burn..
Any idea's theory's
Any idea's theory's
Fleet Mechanic
Joined: Nov 2003
Posts: 1,372
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From: West Cornwall, CT
I would pull an oil sample and send it out to Blackstone (a site sponsor)for an oil analysis. They will tell you for sure what the viscosity is and if you have a fuel dilution problem.
It is very tough to judge oil quality by looking at it on a dipstick.
Lou Braub
It is very tough to judge oil quality by looking at it on a dipstick.
Lou Braub
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From: Texas
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From: SW Va
I agree it kinda sounds like fuel dilution, if so & the fuel pressure checks out ok, maybe suspect the carb float is sticking, or maybe has a leak in it & won't float to shut fuel off, to prevent the float bowl from overfilling, or maybe excessve fuel pressure has caused it's settings to go out of calibration, or maybe the float bowl valve seat or seal is the culprit.
Could even be trash in the bottom of the float bowl not allowing it to properly seal, or maybe the seal material is just bad.
Anyway check the fuel pressure & if ok you might try draining the float bowl & see if any trash comes out that might prevent the float valve from sealing, so draining it might flush the bowl out.
When it's idling, look in the top of the carb & see if you can detect fuel spilling out of the vent tubes into the carbs throat, if so the float is allowing the bowl to overfill for some reason.
I believe a oil analisis is about $20 in round numbers.
A bunch more thoughts for pondering.
Could even be trash in the bottom of the float bowl not allowing it to properly seal, or maybe the seal material is just bad.
Anyway check the fuel pressure & if ok you might try draining the float bowl & see if any trash comes out that might prevent the float valve from sealing, so draining it might flush the bowl out.
When it's idling, look in the top of the carb & see if you can detect fuel spilling out of the vent tubes into the carbs throat, if so the float is allowing the bowl to overfill for some reason.
I believe a oil analisis is about $20 in round numbers.
A bunch more thoughts for pondering.
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
If I understand your post, you are talking about 15W-50 full synthetic, probably Mobil One. Because synthetics flow better at low temperatures, it will tend not to "cling" to the dipstick at room temperature. This is normal.
Jim
Posting Guru
Joined: Jun 1999
Posts: 1,642
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From: Northern California
It is money well spent, as this is not normal. Even a small amount of gasoline introduction into the oil, will weaken and dilute the system. Using a 15w50 oil (or higher) is not even going to solve the problem.
One way to tell if moisture or coolant is in the oil, is to drop a tiny amount onto a hot exahust pipe or manifold. If you see bubbles, or white steam = moisture / coolant involved.
Clearly though, I'd send a sample of your oil to Blackstone Labs, and this way you won't have to guess anymore.
My inclination: You're gettting trace amounts of gasoline in the oil via a bad choke or lazy opening choke at cold start, or gasoline leaking down during heat soak after the engine is shut off.
If nothing else, too I'd rebuild or have a good shop rebuild your Holley 4bbl. However, get a lab analysis done...
Ed
One way to tell if moisture or coolant is in the oil, is to drop a tiny amount onto a hot exahust pipe or manifold. If you see bubbles, or white steam = moisture / coolant involved.
Clearly though, I'd send a sample of your oil to Blackstone Labs, and this way you won't have to guess anymore.
My inclination: You're gettting trace amounts of gasoline in the oil via a bad choke or lazy opening choke at cold start, or gasoline leaking down during heat soak after the engine is shut off.
If nothing else, too I'd rebuild or have a good shop rebuild your Holley 4bbl. However, get a lab analysis done...
Ed
Senior User
Joined: Sep 2007
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I agree 100% with that. You can't judge it by looking at it. Well, you can tell a little, but not the exact viscosity.
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Elder User
Joined: Apr 2002
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From: Texas
Well when it runs off the dip stick like water and leaves nothing behind there is some thing wrong going on, I found out what I think is the source, one of the screws on the bottom of my carb is leaking large amounts of gas, I tried tightening it and it stilled leaked I put some sealant on the threads and it still leaked every where, so I am now officially sick of screwing with it, gonna go get a Edelbrock..