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Old 08-13-2017, 11:06 AM   #1
Barry6547
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***, Ok...it appears many folks are checking their oil when the engine is hot...and according to most, at about 10 minutes after the engine has been shut down. Please indulge me for sharing the following...

After a lengthy drive, I parked the Vette and immediately checked both oil and coolant temps and noted what the dipstick showed then and in measured time afterward as well:

Oil Temp. Coolant Temp. When checked Dipstick reading

217 205 At shutdown (5:40pm) Above Max.

217 207 10 min. later (5:50pm) Above Max.

201 212 5:55 pm Above Max.

196 207 6:00 pm Between add & full

194 203 6:05 pm Same as above

189 199 6:10 pm Same

176 181 6:30 pm Same

171 178 6:40 pm Same

The dipstick read the same at 15 minutes as it did at engine shutdown, which to me means that reading the stick between shutdown and 15 minutes later would not be accurate; however, at 20 minutes after engine shutdown and up to at least one hr. after shutdown, the oil level read the same...in this case midway between the ADD and FULL on the hashmark area. When I took a cold oil reading this a.m. it indicated Full. So maybe I could add oil when cold a little beyond Full and see how that translates to, say, a 30 minute or so reading after shutting down a hot engine? One caveat: The Vette was in a small garage which probably did not allow cooling as quickly as at a gas station.

Last edited by Barry6547; 08-13-2017 at 11:10 AM. Reason: omission
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Old 08-13-2017, 12:22 PM   #2
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Check oil in am after sitting overnight--that is the true reading of how much oil is in the pan--your full and good to go
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Old 08-13-2017, 12:28 PM   #3
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Check oil in am after sitting overnight--that is the true reading of how much oil is in the pan--your full and good to go
all my life !!!!!
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Old 08-13-2017, 02:12 PM   #4
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Very interesting readings that for the most part make no sense.

First 3 hot show full and then all the rest show down a bit.. Then at full cold the next morning is is full again.

I suggest that you are not carefully reading the dip stick correctly. No personal offense intended.


I read my oil at both full cold in the AM and at the service station every time I fuel the car at the end of fueling to give the oil a chance to drain back to the pan. Readings are always the same for me but I am AR about making sure the hash marks on the stick are facing down when the stick is fully inserted and I have also added a tiny drilled hole to the dip stick at the top of the hash marks to aid in reading it. Basically the same size as the hole at the bottom of the hash marks
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Old 08-13-2017, 03:00 PM   #5
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Tip for checking oil level--after car has sat and cool--take dipstick out--clean with carb cleaner ect. take a piece of electrical black tape-cut to the width of the stick--put on the stick--go measure oil--shows exact level of oil--
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Old 08-13-2017, 03:56 PM   #6
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Tip for checking oil level--after car has sat and cool--take dipstick out--clean with carb cleaner ect. take a piece of electrical black tape-cut to the width of the stick--put on the stick--go measure oil--shows exact level of oil--
I would be a little hesitant to put tape on the stick as it is subjected to a lot of heat. Thanks for the feedback.
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Old 08-13-2017, 03:59 PM   #7
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I would be a little hesitant to put tape on the stick as it is subjected to a lot of heat. Thanks for the feedback.
Thats a good reason to check oil when your suppose to--COLD
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Old 08-13-2017, 04:00 PM   #8
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Originally Posted by 8VETTE7 View Post
Very interesting readings that for the most part make no sense.

First 3 hot show full and then all the rest show down a bit.. Then at full cold the next morning is is full again.

I suggest that you are not carefully reading the dip stick correctly. No personal offense intended.


I read my oil at both full cold in the AM and at the service station every time I fuel the car at the end of fueling to give the oil a chance to drain back to the pan. Readings are always the same for me but I am AR about making sure the hash marks on the stick are facing down when the stick is fully inserted and I have also added a tiny drilled hole to the dip stick at the top of the hash marks to aid in reading it. Basically the same size as the hole at the bottom of the hash marks
Granted, I am not mechanically-inclined...but have never had problems reading dipsticks...and reading cold is not a problem...but when I have checked some 10 minutes or so after shutting down the engine, the level really appears to be higher.....dunno. I am thinking of adding maybe 12 oz. to the cold engine ....then see how that translates after maybe 20 minutes of running. Sorry for making such as issue out of such a basic procedure.
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Old 08-13-2017, 04:08 PM   #9
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Thats a good reason to check oil when your suppose to--COLD
Well, I have always been a cold-checker, but the fact that the owner's manual states that checking the oil cold can be misleading as the oil level may be lower than shown....I'm just perplexed about this whole thing....

Last edited by Barry6547; 08-13-2017 at 04:09 PM. Reason: error
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Old 08-13-2017, 04:16 PM   #10
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Granted, I am not mechanically-inclined...but have never had problems reading dipsticks...and reading cold is not a problem...but when I have checked some 10 minutes or so after shutting down the engine, the level really appears to be higher.....dunno. I am thinking of adding maybe 12 oz. to the cold engine ....then see how that translates after maybe 20 minutes of running. Sorry for making such as issue out of such a basic procedure.
What dont you understand--put the tape on stick when motor is cold--read the stick--that is where your oil is--your not reading the oil right--c5 is hard to read--just wait--let us know
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Old 08-13-2017, 06:46 PM   #11
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Tip for checking oil level--after car has sat and cool--take dipstick out--clean with carb cleaner ect. take a piece of electrical black tape-cut to the width of the stick--put on the stick--go measure oil--shows exact level of oil--
DEFINITELY something I would never do or recommend. What happens if the tape doesn't stick well enough and comes off before you remove the stick??? Piece of electrical tape is NOT something I want inside the engine and in the oil.

Anyone guess where it will end up and what damage it could cause...........

Last edited by 8VETTE7; 08-13-2017 at 06:47 PM.
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Old 08-13-2017, 07:02 PM   #12
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DEFINITELY something I would never do or recommend. What happens if the tape doesn't stick well enough and comes off before you remove the stick??? Piece of electrical tape is NOT something I want inside the engine and in the oil.

Anyone guess where it will end up and what damage it could cause...........
I have checked my oil with this method for 5 years--Never a problem--you clean the dipstick well the tape sticks--in fact every time after checking oil-i have to scrape tape off--it sticks--try black paint im sure that works also--its really hard to see where the level is especially with new oil--need some color on the stick-to-show level-

Last edited by royal flush; 08-13-2017 at 07:08 PM.
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Old 08-13-2017, 07:06 PM   #13
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I have checked my oil with this method for 5 years--Never a problem--you clean the dipstick well the tape sticks--in fact every time after checking oil-i have to scrape tape off--it sticks--try black paint im sure that works also--its really hard to see where the level is especially with new oil--need some flat color on the stick-to-show level-
I guess there is always year #6 and beyond............. JMHO
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Old 08-13-2017, 08:29 PM   #14
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I guess there is always year #6 and beyond............. JMHO
6-7-8-9-10-on and on--a piece of plastic tape the width of the dipstick and 1/2 inch long--will do what to the motor? Really

Last edited by royal flush; 08-13-2017 at 10:15 PM.
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Old 08-14-2017, 07:29 AM   #15
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6-7-8-9-10-on and on--a piece of plastic tape the width of the dipstick and 1/2 inch long--will do what to the motor? Really
You mean if it gets sucked up against the screen of the oil pickup, and restricts the flow of oil? Or worse, manages to get past the screen, and gets into the oil pump?
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Old 08-14-2017, 07:43 AM   #16
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Not risking loose tape restricting blood flow to major organs.
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Old 08-14-2017, 09:04 AM   #17
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DEFINITELY something I would never do or recommend. What happens if the tape doesn't stick well enough and comes off before you remove the stick??? Piece of electrical tape is NOT something I want inside the engine and in the oil.

Anyone guess where it will end up and what damage it could cause...........
And don't want any electrical tape in the engine.
Terrible way to check your oil level.

Last edited by runner140*; 08-14-2017 at 09:05 AM. Reason: add
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Old 08-14-2017, 09:24 AM   #18
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And don't want any electrical tape in the engine.
Terrible way to check your oil level.
Have any other C5 owners had trouble reading the dipstick when the engine is hot?
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Old 08-14-2017, 09:50 AM   #19
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Originally Posted by 8VETTE7 View Post
DEFINITELY something I would never do or recommend. What happens if the tape doesn't stick well enough and comes off before you remove the stick??? Piece of electrical tape is NOT something I want inside the engine and in the oil.

Anyone guess where it will end up and what damage it could cause...........
I thought the same thing when i read his comment....
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Old 08-14-2017, 11:03 AM   #20
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Have any other C5 owners had trouble reading the dipstick when the engine is hot?
All c5 sticks hard to read--if not the tape method--take flat black spray paint--from the add hole to the full hole--let dry--give you right on reading--take paint remover--good to go--either method gives you a clear reading-
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