engine cap off while engine is running
Race Director
Joined: Feb 2011
Posts: 14,719
Likes: 5,597
From: AZ
2020 C8 owners manual, page 219:
To check the engine oil:
1. Turn the engine on and let it
warm up to at least 80 °C
(175 °F).
2. Once the engine is warm,
check the oil while the engine
is running at idle.
To check the engine oil:
1. Turn the engine on and let it
warm up to at least 80 °C
(175 °F).
2. Once the engine is warm,
check the oil while the engine
is running at idle.
Race Director
Joined: Feb 2004
Posts: 11,030
Likes: 2,587
From: Del Boca Vista FL
It took 15 months from order to delivery of my C8. I downloaded and read the owners manual several times before I received the car. That way I had a clue as to operations on the car.
You might consider that. Then you could comment from an informed position.
When your car arrives I hope you enjoy it as much as I do mine.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
Unfortunate you feel that way.
It took 15 months from order to delivery of my C8. I downloaded and read the owners manual several times before I received the car. That way I had a clue as to operations on the car.
You might consider that. Then you could comment from an informed position.
When your car arrives I hope you enjoy it as much as I do mine.
It took 15 months from order to delivery of my C8. I downloaded and read the owners manual several times before I received the car. That way I had a clue as to operations on the car.
You might consider that. Then you could comment from an informed position.
When your car arrives I hope you enjoy it as much as I do mine.
As far as my commenting from an informed position, I belevice many on CF feel I do just that as is evident from my over 5200 'likes' to my posts in just 4 years.
Last edited by Kevin A Jones; Jun 25, 2021 at 09:16 PM.
Race Director
Joined: Feb 2004
Posts: 11,030
Likes: 2,587
From: Del Boca Vista FL
I like I stated earlier I've owned close to 40 Corvettes over the years so don't believe I will have any problem figuring this one out. Came over here to the C8 forum a couple weeks to both share and pick up info. Anyway, I have plenty of time until mine arrives.
As far as my commenting from an informed position, I belevice many on CF feel I do just that as is evident from my over 5200 'likes' to my posts in just 4 years.
As far as my commenting from an informed position, I belevice many on CF feel I do just that as is evident from my over 5200 'likes' to my posts in just 4 years.
I can’t presume to rival your ownership of nearly 40 Corvettes. This is only my eighth. From my experience over the past 50 plus years, having owned and driven each generation excepting C7, I find the C8 to be an outstanding automobile. I hope for you that you enjoy yours.
Moderator
Joined: Dec 2002
Posts: 40,888
Likes: 4,342
From: Lakewood Ranch, FL
Reading up on your C8 to come would not be a bad idea.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
Glad for you that you are so “liked”.
I can’t presume to rival your ownership of nearly 40 Corvettes. This is only my eighth. From my experience over the past 50 plus years, having owned and driven each generation excepting C7, I find the C8 to be an outstanding automobile. I hope for you that you enjoy yours.
I can’t presume to rival your ownership of nearly 40 Corvettes. This is only my eighth. From my experience over the past 50 plus years, having owned and driven each generation excepting C7, I find the C8 to be an outstanding automobile. I hope for you that you enjoy yours.
Looking forward to getting mine, glad you are enjoying yours.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
The answer was not smart assed. Maybe a tad blunt. The owners manuals are available on line, including here: Manuals, Reference Material, FAQs, DIY Threads - CorvetteForum - Chevrolet Corvette Forum Discussion
Reading up on your C8 to come would not be a bad idea.
Reading up on your C8 to come would not be a bad idea.
I've picked up A LOT of info in just the last few weeks, it just surprised me that you check the C8 oil while engine running. I just assumed the C8's dry-sump
system would be similar to the C7s, at least in the way the oil is checked.
Not a good thing to ASSUME anything for these cars so will probably wait until the 2022 owner's manual comes out.
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,183
From: Central Illinois
I will/have been reading up quite a bit however my C8 will be a 2022 or perhaps even a 2023, so reading a 2021 manual may be a little premature.
I've picked up A LOT of info in just the last few weeks, it just surprised me that you check the C8 oil while engine running. I just assumed the C8's dry-sump
system would be similar to the C7s, at least in the way the oil is checked.
Not a good thing to ASSUME anything for these cars so will probably wait until the 2022 owner's manual comes out.
I've picked up A LOT of info in just the last few weeks, it just surprised me that you check the C8 oil while engine running. I just assumed the C8's dry-sump
system would be similar to the C7s, at least in the way the oil is checked.
Not a good thing to ASSUME anything for these cars so will probably wait until the 2022 owner's manual comes out.
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Race Director
Joined: Feb 2011
Posts: 14,719
Likes: 5,597
From: AZ
The biggest change from 20 to 21 was wireless android auto and apple car play. 22' have some technical changes to the engine tune which allows 4-cylinder mode to operate more often. A few color changes so nothing to worry about "extensive" OM changes on the C8 by model year to "unlearn"/
Pro
Joined: Aug 2020
Posts: 622
Likes: 366
The cap you are referring to I assume is oil the sump/ recovery tank. My 2 C7’s had this sump system and I had them open during
engine startup car running inspection for leaks.
Non issue my experience there was not blowback because of engine idle low rpms.
engine startup car running inspection for leaks.
Non issue my experience there was not blowback because of engine idle low rpms.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,937
Likes: 12,351
From: NE South Carolina
Similar reason you could not wait more than 10 minutes to check oil level in a dry sump C7. Oil would flow back to the pan and you'd get a low reading.
Actually the wife's BMW is similar. In that case no dip stick they use oil level sensors. The oil level can be checked but with the engine running and over a few minutes.
A pic of the dry sump is below. Instead of letting oil that goes to the rocker arms run down to the pan there is an oil scavenge pump in the lifter valley! It has 3 scavenge pumps not one like the C7.
Note for OP. If the cap you're is referring to is the one on top of the fill tube, would think you could run the car forever with it off on a smooth road! Oil is just being pumped into the tank by 3 oil scavenge pumps and delivered under pressure to the engine by one pump.
GM mentions the two added scavenge stages contribute to reducing internal crankcase pressure and increasing vacuum. That is similar to racing dry sump system with multiple scavenge pumps where the vacuum created has the crank and rods spinning in lower than atmospheric pressure and can add 10+ hp. Doubt the C8 system adds that much BUT everything helps!
Last edited by JerryU; Jun 26, 2021 at 03:11 PM.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
It's similar to an automatic transmission, the dry sump tank is part of the engine. So like a "slushbox automatic" the engine oil must be pumping to have it stay in the dry sump tank (as it must in the "slushbox" torque converter) for proper measurement. Shut it off and some runs back to the pan.
Similar reason you could not wait more than 10 minutes to check oil level in a dry sump C7. Oil would flow back to the pan and you'd get a low reading.
Actually the wife's BMW is similar. In that case no dip stick they use oil level sensors. The oil level can be checked but with the engine running and over a few minutes.
A pic of the dry sump is below. Instead of letting oil that goes to the rocker arms run down to the pan there is an oil scavenge pump in the lifter valley! It has 3 scavenge pumps not one like the C7.
Note for OP. If the cap you're is referring to is the one on top of the fill tube, would think you could run the car forever with it off on a smooth road! Oil is just being pumped into the tank by 3 oil scavenge pumps and delivered under pressure to the engine by one pump.
GM mentions the two added scavenge stages contribute to reducing internal crankcase pressure and increasing vacuum. That is similar to racing dry sump system with multiple scavenge pumps where the vacuum created has the crank and rods spinning in lower than atmospheric pressure and can add 10+ hp. Doubt the C8 system adds that much BUT everything helps!
Similar reason you could not wait more than 10 minutes to check oil level in a dry sump C7. Oil would flow back to the pan and you'd get a low reading.
Actually the wife's BMW is similar. In that case no dip stick they use oil level sensors. The oil level can be checked but with the engine running and over a few minutes.
A pic of the dry sump is below. Instead of letting oil that goes to the rocker arms run down to the pan there is an oil scavenge pump in the lifter valley! It has 3 scavenge pumps not one like the C7.
Note for OP. If the cap you're is referring to is the one on top of the fill tube, would think you could run the car forever with it off on a smooth road! Oil is just being pumped into the tank by 3 oil scavenge pumps and delivered under pressure to the engine by one pump.
GM mentions the two added scavenge stages contribute to reducing internal crankcase pressure and increasing vacuum. That is similar to racing dry sump system with multiple scavenge pumps where the vacuum created has the crank and rods spinning in lower than atmospheric pressure and can add 10+ hp. Doubt the C8 system adds that much BUT everything helps!
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
The C8 you need to warm it up a little and leave engine running at idle while you check the oil level.
If you don't follow that advice, the oil level will read TOO LOW and then you will add oil when you shouldn't have.
I just checked mine and the oil looks clear as brand new, only have 850mi on the ODO though.
Did you add oil to yours because you pulled the stick on a cold engine and thought it was low? Be careful.
Last edited by dohabandit; Jun 26, 2021 at 10:03 PM.
Pro
Joined: Jun 2014
Posts: 722
Likes: 274
From: Colorado Springs, CO
I like I stated earlier I've owned close to 40 Corvettes over the years so don't believe I will have any problem figuring this one out. Came over here to the C8 forum a couple weeks to both share and pick up info. Anyway, I have plenty of time until mine arrives.
As far as my commenting from an informed position, I belevice many on CF feel I do just that as is evident from my over 5200 'likes' to my posts in just 4 years.
As far as my commenting from an informed position, I belevice many on CF feel I do just that as is evident from my over 5200 'likes' to my posts in just 4 years.
Race Director
Joined: Sep 2016
Posts: 13,180
Likes: 10,522
I like I stated earlier I've owned close to 40 Corvettes over the years so don't believe I will have any problem figuring this one out. Came over here to the C8 forum a couple weeks to both share and pick up info. Anyway, I have plenty of time until mine arrives.
As far as my commenting from an informed position, I belevice many on CF feel I do just that as is evident from my over 5200 'likes' to my posts in just 4 years.
As far as my commenting from an informed position, I belevice many on CF feel I do just that as is evident from my over 5200 'likes' to my posts in just 4 years.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
It literally says it on the dip stick, LOL!
The C8 you need to warm it up a little and leave engine running at idle while you check the oil level.
If you don't follow that advice, the oil level will read TOO LOW and then you will add oil when you shouldn't have.
I just checked mine and the oil looks clear as brand new, only have 850mi on the ODO though.
Did you add oil to yours because you pulled the stick on a cold engine and thought it was low? Be careful.
The C8 you need to warm it up a little and leave engine running at idle while you check the oil level.
If you don't follow that advice, the oil level will read TOO LOW and then you will add oil when you shouldn't have.
I just checked mine and the oil looks clear as brand new, only have 850mi on the ODO though.
Did you add oil to yours because you pulled the stick on a cold engine and thought it was low? Be careful.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
