damage from overfilling oil
Thread Starter
Rennlist Member
Joined: Aug 2006
Posts: 1,373
Likes: 2
From: Boston Ma.
damage from overfilling oil
Got the oil changed in the beast today. I used an independent I have used before but I think he over filled the oil, because after sitting for about an hour I went out to the garage and found about a 1/2 qt. of oil on the floor. I drove about 3 miles home with out incident and did not notice any smoke. He may have just put the 14 qts in without ck. as he added.
before i go back tommrow, any words of wisdom as to how much damage could have been done or how to analize. Any help would be appreciated.
before i go back tommrow, any words of wisdom as to how much damage could have been done or how to analize. Any help would be appreciated.
Burning Brakes
Joined: Apr 2006
Posts: 1,118
Likes: 6
From: Central Washington State
Did you check the dip stick at idle, before assuming it's been overfilled? Should be preferrably between the two marks and never above the top mark with the engine idling at operating temperature.
I don't think you need to worry about damage as such....just oil entering the intake through the oil tank breather and gooing up all the plumbing. With enough oil being sucked in with the air charge, though, a person should be concerned about a leaner air-to-fuel ratio (that extra oil being sucked in will displace some of the gas). But unless you were blasting along on full boost, probably not to worry. Check the level, drain some out if necessary to get the correct amount before driving it anymore.
I don't think you need to worry about damage as such....just oil entering the intake through the oil tank breather and gooing up all the plumbing. With enough oil being sucked in with the air charge, though, a person should be concerned about a leaner air-to-fuel ratio (that extra oil being sucked in will displace some of the gas). But unless you were blasting along on full boost, probably not to worry. Check the level, drain some out if necessary to get the correct amount before driving it anymore.
Thread Starter
Rennlist Member
Joined: Aug 2006
Posts: 1,373
Likes: 2
From: Boston Ma.
Did you check the dip stick at idle, before assuming it's been overfilled? Should be preferrably between the two marks and never above the top mark with the engine idling at operating temperature.
I don't think you need to worry about damage as such....just oil entering the intake through the oil tank breather and gooing up all the plumbing. With enough oil being sucked in with the air charge, though, a person should be concerned about a leaner air-to-fuel ratio (that extra oil being sucked in will displace some of the gas). But unless you were blasting along on full boost, probably not to worry. Check the level, drain some out if necessary to get the correct amount before driving it anymore.
I don't think you need to worry about damage as such....just oil entering the intake through the oil tank breather and gooing up all the plumbing. With enough oil being sucked in with the air charge, though, a person should be concerned about a leaner air-to-fuel ratio (that extra oil being sucked in will displace some of the gas). But unless you were blasting along on full boost, probably not to worry. Check the level, drain some out if necessary to get the correct amount before driving it anymore.
No high way driving home so I did not go to boost. I thought it weird that there was no smoke though. I am going to install a fabspeed muffler and remove the cat at he same time I drain off the oil so won't drive it at boost till after I am through.
Race Director
Joined: Nov 2006
Posts: 15,863
Likes: 1,632
From: Clifton, NJ
the real concern is fouling plugs and detonation, because oil will reduce the octane of the fuel.
Burning Brakes
Joined: Apr 2006
Posts: 1,118
Likes: 6
From: Central Washington State
[QUOTE=Quadcammer;8888092]not really. it doesn't displace the gas, and it acts as a fuel to some extent.QUOTE]
I was wondering if someone would call me out on that statement (a long shot guess on my part)
It is true, however, when applied to 2 stroke machines using gas/oil pre-mix. Of course, those run anywhere from 20:1 to 60:1 gas-to-oil ratios. People (dirt bikers primarily, as I am one) often get confused feeling that running leaner fuel/oil ratios will cause leaner combustion AFR's. Quite the reverse. Less oil in a mix results in more gas available to burn, thus richer AFR's. Conversley, more oil in the mix results in leaner AFR's when burned.
In a car with miniscule oil in the intake, probably has no real affect on AFR's but could result in fouled plugs as you mentioned. So, I stand...once again...humbled and guilty of letting my mind wander in minutia.
I was wondering if someone would call me out on that statement (a long shot guess on my part)
It is true, however, when applied to 2 stroke machines using gas/oil pre-mix. Of course, those run anywhere from 20:1 to 60:1 gas-to-oil ratios. People (dirt bikers primarily, as I am one) often get confused feeling that running leaner fuel/oil ratios will cause leaner combustion AFR's. Quite the reverse. Less oil in a mix results in more gas available to burn, thus richer AFR's. Conversley, more oil in the mix results in leaner AFR's when burned.
In a car with miniscule oil in the intake, probably has no real affect on AFR's but could result in fouled plugs as you mentioned. So, I stand...once again...humbled and guilty of letting my mind wander in minutia.
Racer
Joined: Apr 2008
Posts: 261
Likes: 2
From: Seattle-ish
Hello all,
I've read many times on this and other forums, about overfilling the oil during an oil change......I just don't get it......either with D.I.Y'ers or with mechanics.
I mean you drain the tank, drain the sump, change the oil filter and add 11 quarts('76-'89 930) and your done. All in all, this takes no more than 25-30 minutes.
Mark
I've read many times on this and other forums, about overfilling the oil during an oil change......I just don't get it......either with D.I.Y'ers or with mechanics.
I mean you drain the tank, drain the sump, change the oil filter and add 11 quarts('76-'89 930) and your done. All in all, this takes no more than 25-30 minutes.
Mark
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Joined: Aug 2011
Posts: 12
Likes: 0
From: Evergreen, CO
Some of us are told that it will burn 1qt every 1k miles and then don't know that the gauge on the dash/tank won't really show any oil until the car is *really* warmed up and on a cool morning after a 1k mile day and before another checks and adds a qt "since it's low"
I'm still cleaning up oil from that one.
I'm still cleaning up oil from that one.
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Race Director
Joined: Nov 2006
Posts: 15,863
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From: Clifton, NJ
[quote=Mark Houghton;8888691]
its all good! the end result is the same and bad either way.
not really. it doesn't displace the gas, and it acts as a fuel to some extent.QUOTE]
I was wondering if someone would call me out on that statement (a long shot guess on my part)
It is true, however, when applied to 2 stroke machines using gas/oil pre-mix. Of course, those run anywhere from 20:1 to 60:1 gas-to-oil ratios. People (dirt bikers primarily, as I am one) often get confused feeling that running leaner fuel/oil ratios will cause leaner combustion AFR's. Quite the reverse. Less oil in a mix results in more gas available to burn, thus richer AFR's. Conversley, more oil in the mix results in leaner AFR's when burned.
In a car with miniscule oil in the intake, probably has no real affect on AFR's but could result in fouled plugs as you mentioned. So, I stand...once again...humbled and guilty of letting my mind wander in minutia.
I was wondering if someone would call me out on that statement (a long shot guess on my part)
It is true, however, when applied to 2 stroke machines using gas/oil pre-mix. Of course, those run anywhere from 20:1 to 60:1 gas-to-oil ratios. People (dirt bikers primarily, as I am one) often get confused feeling that running leaner fuel/oil ratios will cause leaner combustion AFR's. Quite the reverse. Less oil in a mix results in more gas available to burn, thus richer AFR's. Conversley, more oil in the mix results in leaner AFR's when burned.
In a car with miniscule oil in the intake, probably has no real affect on AFR's but could result in fouled plugs as you mentioned. So, I stand...once again...humbled and guilty of letting my mind wander in minutia.
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