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I don't think it actually "needs" 1/2 extra qt. for track use. It's just added insurance to assure that all the internally lubricated parts get ample lubrication at extended WOT.
It's no different than a lot of things that are traditionally done to prep a car for track use. This one requires surprisingly little.
Internal combustion engines will burn a little oil during sustained high rpm use, and while no one at GM has ever come out and said this is the reason for over filling slightly, it certainly makes perfect sense to start the session slightly overfull.
Yes, but in a "competitive event," you're running high rpms, and the oil is flowing throughout the engine at a much higher volume, so there is no danger of oil burping into the air intake. The reason for taking it out after the event is that you don't want to be puttering around town overfilled at low rpms, which is why the manual says to remove it after the event.
well at least now he has a reason for some spirited driving!
Then why would they recommend removing it after? Wouldn't it already be gone?
Not necessarily.
One driver may not push the car ten tenths of its potential while another driver might. The objective to prepare the car for either situation.
Same thing happened to me... dealer overfilled by about 3/4 quart. I bought this cheap p[ump off amazon and it worked just fine getting it out. Not a bad tool to have on hand:
Then why would they recommend removing it after? Wouldn't it already be gone?
I didn't appear to burn any oil during my sessions. The amount I overfilled I sucked back out at the end of the day. Either way, just make sure it's at the proper dipstick level for street.
I also question why they say to add a 1/2 quart for racing in the first place, isn't the specified 9.5 to 9.8 quarts enough already?
Yes for street use.
The extra for track use is purely to avoid the possibility of any part of the engine being deprived of adequate oiling at high rpms, pulling high G's on the track. Under those conditions, oil is flowing throughout the engine at a much higher rate.
The extra for track use is purely to avoid the possibility of any part of the engine being deprived of adequate oiling at high rpms, pulling high G's on the track. Under those conditions, oil is flowing throughout the engine at a much higher rate.
Do you really believe that gm designed an oiling system with insuffiient capacity of just one half quart ? Do you really think that ? Lol ....
No, I don't believe that. However, it is GM guidance for whatever reason and provides an extra margin of protection.
Ok so here is the reason. Under sustsined max load and max rpm conditions, any internal combustion can be expected to burn some amount of oil. So starting with it full means you might finish with it low depending on the circumstances. Starting with it slightly over full is the best way to compensate for this.
Yes, but in a "competitive event," you're running high rpms, and the oil is flowing throughout the engine at a much higher volume, so there is no danger of oil burping into the air intake. The reason for taking it out after the event is that you don't want to be puttering around town overfilled at low rpms, which is why the manual says to remove it after the event.
Could be worse... look at how much my dealer overfilled today. Smokes!
Z06 dry sump, checked about 9 minutes after turning it off from bringing it home. Granted when I got home engine oil temp was like 213. I still think this is way overfilled.
What do do you folks think? If you can see the line it’s way above the top hash/circle along the right edge of the picture .
Could be worse... look at how much my dealer overfilled today. Smokes!
Z06 dry sump, checked about 9 minutes after turning it off from bringing it home. Granted when I got home engine oil temp was like 213. I still think this is way overfilled.
What do do you folks think? If you can see the line it’s way above the top hash/circle along the right edge of the picture .
Seems overfilled to me. Not sure by how much, might be they dumped in 10 qts & maybe did not get all the old oil drained out. It appears to be filled more than the distance between the lower & upper oil level range marks.
You ran the engine on level ground up to operating temp (175 degrees F) , & checked the oil level at 5 to 10 minutes after turning off the engine?
Seems overfilled to me. Not sure by how much, might be they dumped in 10 qts & maybe did not get all the old oil drained out. It appears to be filled more than the distance between the lower & upper oil level range marks.
You ran the engine on level ground up to operating temp (175 degrees F) , & checked the oil level at 5 to 10 minutes after turning off the engine?
yep.. level ground, parked in garage at about 213 oil temp.. shut car down.. waited about 8-9 mins and then read the gauge, wiped, read the gauge, etc like 3 times because i couldn't believe my eyes lol.
It showed was past the dipstick bend.. my dealer sheet showed 11 qty of the GM 5/30 oil, im betting they put in 11 qts.. ack!
i waited for the temp to drop so it was safe suck out about 2 qts.. hope the major overfill didn't cause any damage.
yep.. level ground, parked in garage at about 213 oil temp.. shut car down.. waited about 8-9 mins and then read the gauge, wiped, read the gauge, etc like 3 times because i couldn't believe my eyes lol.
It showed was past the dipstick bend.. my dealer sheet showed 11 qty of the GM 5/30 oil, im betting they put in 11 qts.. ack!
i waited for the temp to drop so it was safe suck out about 2 qts.. hope the major overfill didn't cause any damage.
If there is a next time tell them to put in 9 qts & give you the remaining quart so you can top it off yourself ! If you didn't go WOT you may have dodged the bullet. Keep your eye on things. Don't lose the dealer sheet showing how much they put in.
It's stories like these which reaffirm that my decision to do my own oil changes (despite getting a bunch of free ones) is the right one. As long as I am physically able to do it, I will never let someone else change my oil for me.
The people doing oil changes at a dealer are usually the least experienced/greenest person working on cars. Anyone with experience turning wrenches is put to work on more meaningful jobs. So yeah...
The few times I've taken my car to a dealer for an oil change, I actually hang out in the service bay and supervise. The only reason I even go to a dealer is because they do free oil changes on GM vehicles if you're a veteran.
06-07-2018, 10:15 AM
