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New C8 Going over Car checked oil almost panicked didn’t read on dip stick so put a quart in and still no reading, go online and find out I’m checking it wrong. Question is can I start motor without putting oil in places it shouldn’t be, I’m thinking of a full oil change as the car has 550 miles now and my hoist is 25 feet away and a four post so not able to push car onto lift.
New C8 Going over Car checked oil almost panicked didn’t read on dip stick so put a quart in and still no reading, go online and find out I’m checking it wrong. Question is can I start motor without putting oil in places it shouldn’t be, I’m thinking of a full oil change as the car has 550 miles now and my hoist is 25 feet away and a four post so not able to push car onto lift.
You might be able to use a Mityvac 7201 Fluid Extractor. I've used one over the years to change oil on an Audi. You insert the vacuum line down the dipstick tube. It works great.
Thanks actually already tried that but when shut off oil is so low in tube couldn’t pickup any, also tried oil fill tank. Not sure where the oil is in system. Don’t want to fire up to check as I see some people getting some oil in intake system ? Wish I understood oil checking system before. Bet this doesn’t happen again.
Last edited by Jon Shelton; Oct 31, 2020 at 08:20 AM.
if you already have a lift why not use it? Find a way to get it on there use a friend(s) or winch to pull it up there.
My limited experience would tell me that overfill of one quart should not be a problem at idle or low rpm. I would drive it up on the lift if it were my car but woudn't let the RPM get too high. I however have to say do it at your own risk.
If it was mine I would start up and check the level. The LT2 has 3 scavenging pumps so excess oil in the block won't be an issue. I think you'd have to overfill it to the point the reservoir is completely full for there to be an issue just to check the level. You might pull some oil into the intake, but a one time incident isn't going to hurt it in the long run and I kind of doubt you will with just idling it.
New C8 Going over Car checked oil almost panicked didn’t read on dip stick so put a quart in and still no reading, go online and find out I’m checking it wrong. Question is can I start motor without putting oil in places it shouldn’t be, I’m thinking of a full oil change as the car has 550 miles now and my hoist is 25 feet away and a four post so not able to push car onto lift.
Your call on changing the oil BUT the C8 is not like the C7 or C6 dry sump. Even the C7 said don't overfill the dry sump except for Tracking THEN after it said to remove the oil!
This is what the C8 states on page 219 of the owner's manual: CAUTION: Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If the oil level is above the operating range (i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range), the engine could be damaged. Drain the excess oil or limit driving of the vehicle, and seek a service professional to remove the excess oil.
When I got my 2017 Grand Sport the super Corvette Tech doing the PDI said, "I know you said to leave the dry sump tank if not less than 1/2 quart low as that is where you keep it. But I did check and it's ~ 1/2 quart high from the factory." No big deal BUT I drained ~ 3/4 of a quart using my brake bleed hand pump and some aquarium tubing I had. See Amazon has one for $20. There are some simple fluid transfer pumps for <$10.
You always check a dry sump engine oil level with the engine running. If the engine is not running and it sits for a while, the oil in the dry sump tank will drain back through the oil pump gear and back into the oil pan. Blame gravity for this fact .
Was able to extract oil out. Small pump and hose into dipstick tube, fired motor for few seconds that refilled oil tank pumped excess out out. Thanks for all the quick help. Jon
You always check a dry sump engine oil level with the engine running. If the engine is not running and it sits for a while, the oil in the dry sump tank will drain back through the oil pump gear and back into the oil pan. Blame gravity for this fact .
Sigh. No, you don't ALWAYS check a dry sump with the engine running. Read the C7 owners manual.
Was able to extract oil out. Small pump and hose into dipstick tube, fired motor for few seconds that refilled oil tank pumped excess out out. Thanks for all the quick help. Jon
I am sorry did you say you started up the car for a few seconds, so the oil tank will get filled, then you pumped oil out from dipstick tube? It must be a long and small tube to get all the way down there?!
Dealer overfilled my engine oil by 1/2 to 3/4 inches over the max line on the dipstick, I drove 30 min home, do you think any damage was done?! idle oil pressure was 36psi when cold, when warm on highway it was 29 psi.
I used a small hand pump with very small inlet hose, seemed like I just reached the oil and then pumped but started sucking air, started engine for just 4 or 5 seconds and tank level seemed to fill up at that time got the remaining oil out. Think I had 2 or 3 quarts too much. From what I found it probably doesn’t hurt anything as it didn’t put oil up in any other places.
^^^^^
Glad you got corrected. GM does not put these words in C8 Owner's Manual for nothing: CAUTION Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If the oil level is above the operating range (i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range), the engine could be damaged. Drain the excess oil or limit driving of the vehicle, and seek a service professional to remove the excess oil.
^^^^^
Glad you got corrected. GM does not put these words in C8 Owner's Manual for nothing: CAUTION Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If the oil level is above the operating range (i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range), the engine could be damaged. Drain the excess oil or limit driving of the vehicle, and seek a service professional to remove the excess oil.
I have read several threads about overfilling the engine oil, if there is a problem is it long term and shows up much later? because I have yet to read someone that reported a problem. ( I suppose if it's only one of two trip then it's fine ? and limit driving of the vehicle like the manual says and drain the excess oil ASAP, or maybe I just didn't run into posts that have reported the problems ? )
^^^
Have not seen posts with significant over. Don't see long term but more short term issues like blocking oil from the PCV system being returned to the dry dump tank.
May be this or others. GM does not say, just correct!
Right! The service manual says the oil tank has a "centrigfugal airoil spearater". "Incorporated within the engine oil tank assembly are the oil level indicator(3), oil fill cap(2), positive crankcase ventilation(PCV) centrifugal air/oil separator(6), and an oil pick up screen(4)."
If the tank is overfilled it will interfere with the operation of the PCV system. One can speculate that it might affect crankcase pressure, but also it will prevent proper venting of the oil tank as oil and vapors move into and out of the tank during operation.
I noticed the dipstick always reads 'over' when doing a fresh change so I doubt the accuracy of the stick itself. I noticed anyway after hard driving the oil level decreases so adding 1/2 qt is something I do at least 1x 2x in between changes
C8 Oil Overfilled
