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Discussion Starter · #1 ·
I have to put in my .02 cents unfortunately and say, from personal experience, it took exactly one quart to get to the second hole after the low oil light came on today.
I just came back from a trip to the Tampa Bay area. 600 miles total and mostly 6th gear, 75-85mph cruising. Topped off the oil approx. 3-4 weeks ago and today the low oil light came up. Took exactly one quart.

Just to give you guys some background. I have had this car for 13 months now. 5300 miles on the odometer and I have changed the oil 4 times (last time at around 4300 miles) already (approx. evey 3 months) and the tranny and gear oil once.

Up until this trip, practically NADA on the oil consumption and I have posted that many a times when the subject came up. I've even taken the car to Moroso once and after 3-4 runs, not one drop of oil lost. A 1/4 quart here and there, but nothing major... until this trip. Makes you think... 13 months of posting "NADA" and now I lost a quart. :-? Anyone else saying "NADA?" Anyone have any ideas?

I wanted to pose a question to the '01 Z06 owners and if you can, use this thread to post how long you've had the car, how many miles and if any consumption... even if it's as minor as 1/4 per 500 miles. If you do have consumption, at what mark on the odometer did it show up.

I have topped it off today and will keep track. I don't know what to make of it and somewhat perplexed. I mean, I spent the majority of 600 miles at 6th gear and around 2000 rpms... does it not like that rpm level? Yet if I hammer it a few times down the quarter mile, not a drop was used.

I've spent the first 13 months being able to say I haven't had an oil issue. Unfortunately, I have to say I have experienced one finally. If it's a continuing thing or a fluke, we'll have to see.

Interesting way to start the new year. :-?

Don
 

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Hmmmm, I bought mine used with about 6000 on the clock. Just went over 9k and it appears I've lost about 1/3 qt in 3000 miles. Seems pretty normal to me so far. I haven't done any research yet but for all I know, mine could have had the new rings installed.
 

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I'm afraid that I, too, have a consumption problem. However, it doesn't appear to be a big-enough problem just yet, so I'm just holding tight at the moment. I've got @ 5300 miles on the car.

Incidentally, is the oil problem such that the LOW OIL light comes on each time, or are people just seeing that it's using oil by checking the oil regularly?

(My low oil light has never come on, knock on wood.)

Thanks!

-Kirk
 

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I don't think I can trust my dipstick :eek2: I changed my oil at 1100 mile mark and put in 6.5 quarts. I checked my oil the next morning and it read below the add mark-WTF!!:-? :eek: :-? so I added another quart. Oil pressure went to mid 50's and to mid 80's on WOT. So, I did what gm says was our driving problem, and drove at high rpm with low throttle. After a week, the oil pressure went back to 30's on idle and low 50's on WOT. So I guess they do consume the black gold! The next time, i'm just gonna put in the 6.5 qts and the dipstick be damned!!:mad: But I don't think its burned any on it's own yet with 2285 miles on it.
 

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Several years ago GM had a bulletin come out on oil counsumption they said all engines useoil. The reason that they would use more on an extended trip was that the engine would burn off the excess fuel and condensation from the crankcase :roll:
 

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Discussion Starter · #7 ·
People have mentioned checking the PCV system and checking behind the TB blade for signs of oil pooling.

Gonna research what a PCV system is first then look into it. With the suddenness of the problem just popping up... that could be a consideration.

My mindset right now is... As long as it's not damaging to the engine... I rather live with it then to go thru a re-ring. With the miles I put on her, it may take some time to pinpoint what the problem is and by that time... it could be time for a 2003 Z06 or wait for a C6 or maybe a trip to MTI ;)

When I was a kid, I remember reading magazines and people were modding their cars and installing "one-over" or "one-over sized" pistons... Is that something that can still be done in todays engines? What is that exactly? If you gotta do a re-ring, why not just install new pistons too?

Don
 

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don

One over..... .001 oversize.........to tighten up the piston to bore clearances.......
If it's not the rings, and it's the PCV.....then good........

The reason for the NOT changing of the pistons, is that you would have to re-ring ALL 8,( and prep the bore's) and the re-ring's the Gen is doing is only 2 rings.......SUPPOSEDLY.

I have heard of some bore clearances that were extreme, and the whole shebang had to be re-done..(pistons & rings, Oversize).

The problem (as you probably know) is the pressure of the ring(2nd I think) is @ 9#'s.......the new rings are 13#'s............

Giving more pressure against the bore, and controling the "Flutter", problem at low duty cycle, high rpm running.......

Which, at 2000rpm's, for the extended period you drove would/could mimic the "Flutter" phenom exactly..............

Originally, unless changed, the TSB was stating to NOT replace any rings, except the two..............

As always, all pistons were to be put back in orig bore's, and NO cylinder wall disruption was to be made........
In this scenario, no special break in would be required( like for a new set up).
 

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don

I owe GM an apology.....................:D
At least thay accepted PART of the blame........hehehehehe.....
If "Porsche", believes it's customers are THIS stupid.........well, got some swamp land for ya'..........:lol: :lol:
 

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Hmmmm, Strange?? I do all Highway driving. 6th gear 70-90 miles an hour depending on my mood.. Haven't used an oil yet. Not sure why it would use oil after this long????Is It leaking from anywhere???
 

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Discussion Starter · #12 ·
Looks tight as a drum and no drops on the garage floor.

It's puzzling to me too... I've made that exact trip before at the same cruising speed and not a drop was lost. Like I said, for 5000 miles I haven't had an issue and, BAM, 1 quart.

Maybe over time it has developed a ring flutter and unfortunately the flutter occurs at 2000 rpms?

Maybe the PCV system as some have suggested checking?

Maybe just a one-off fluke? (I can hope can't I?)

Those are just a couple of thoughts though since I haven't had the chance to play with the car since I got back so it'll be a while to figure it out. I only have enough time to discuss it on the web :)

I still laugh at that H.H. article and the part on oil consumption where he said that he believes that the driver should also take responsibility for their driving habits and saying it happens under light load, high rpms... "MotorTrend" journalism. :roll:

Don
Jayzvette said:
Hmmmm, Strange?? I do all Highway driving. 6th gear 70-90 miles an hour depending on my mood.. Haven't used an oil yet. Not sure why it would use oil after this long????Is It leaking from anywhere???
:roll:
 

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Don:

Have had my '01 for about 300 miles. Last nite I took her out to enjoy the cold air. The low oil light came on. Was a quart and a bit low. Not sure if it was completely filled when I picked her up (6800 miles), but seems to me that she has a Mobil 1 appetite. But then again, I'm hungry most of the time too.

Gary
 

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Discussion Starter · #14 ·
Congrats on getting the Z.

Well, you really can't tell with 300 miles... so I suggest that you top it off with oil, record the odometer, reset one of the trip counters, and just enjoy the car for a while along with keeping an eye on that dipstick.

I won't lie, it does concern me but I definitely won't keep me from having fun with her and plan to make the most of the cold air down in S. Fla this weekend... along with a quart of Mobil1 in my trunk... just in case. :(

But I can't really do anything either until I put some miles on her and won't get upset and jump to any conclusions until I see what develops too.

In the meantime, enjoy her for all she's worth.

Don
gnoub said:
Don:

Have had my '01 for about 300 miles. Last nite I took her out to enjoy the cold air. The low oil light came on. Was a quart and a bit low. Not sure if it was completely filled when I picked her up (6800 miles), but seems to me that she has a Mobil 1 appetite. But then again, I'm hungry most of the time too.

Gary
 

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Oil Consumption

We seem to have some new '01 owners out here that may not be aware of the oil consumption problem on the '01 Z06's. This has been an ongoing problem with this particular engine. Contrary to one opinion I read below, GM has tried to blame this on the drivers saying that we are driving our cars in too low a gear and reving the engines too much. They cited owners operating their vehicles in city streets with the engine running between 4,000-5,000 rpm.

I got my '01 06 in February of '01, so it was one of the early models. Within 3 weeks of driving it off the lot, I was down a quart of oil. A couple of weeks lated I was down 2 1/2 quarts. After three trips to the dealership, I was told to conduct an oil consumption test. This involves driving your car for 30 days and recording the amount of oil you have to add and the mileage when you add it. It lets you get up close and personal with your car by pulling the dipstick every couple of days.

I established my consupmtion at 1 quart every 500 miles (or two weeks of my driving patterns). After this they re-ringed my engine with factory stock rings. Nothing changed and two weeks later I was back a quart of oil low! I was told at that time that there was a design flaw in the rings and that a custom set of rings would be ordered and installed. This took three months and in August they were finally avaialble for installation. In the meantime my engine had consumed 12 quarts of oil and it was starting to be thrown out the exhaust pipes (I guess the catalytic converter was now full) onto the rear deck of the car.

I filed complaints with GM and eventuually got into the BBB auto line process. I was seeking a replacement car. At the end of the day, the custom rings lessened the oil consumption, but did not eliminate it. I was still using a quart every 1,000 miles. I went to arbitration with the BBB and was awarded a new 2002 engine and exhaust system.

GM really fought me on the exhaust system,saying that the oil in the system should 'burn off' however when I showed the arbitrator the mess that was all over the back end of my car, he ordered them to replace it. I didn't get what I thought I deserved, but at least something was done. I might have the only '01 06 with 405 Hp. I am waiting to hear what GM will do in terms of an extended warranty.

I have also had a host of smaller problems. I have had to have the airconditioning system replaced, twice and numerous small electrical and other problems.

I just picked up my car yesterday, so I won't know if the problem is truly confined to the '01 engine for a little while. But, rest assured, I will be watching and checking.

My advice to all '01 owners with this problem. Do not take this lightly and keep swinging. It is a long and frustrating road, but eventually you will force GM to stand behind their product and do something. Then you might end up with a car like mine!
 

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Oil consumption and PVC valve

John Rovner over at teamzr1.com just posted a GM TSB on oil consumption on the teamZR1 listserve. It's not for Corvetts. It covers 1999-2002 GM CK pickups (with LS-1s?) and 2002 Cadillac Escalades, but involves oil consumption caused by the PCV sucking the oil out of the sump into the intake.

The cure is a new style fixed orifice PCV valve, "Type CV2001-C", the old spring and plunger style is "Type 948-C". I'm going to stop by my local Chevy dealer and get one of these.

I'd forward the TSB, but it's in "styled text" format, and every time I try to forward this type message my Eudora e-mail reader trashes the tables and deletes all the embedded images from my disk.
 

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Hi there,
The bulletin posted by Team ZR1 is NOT to be applied to the Corvette.
The PCV systems are different, and should NOT be applied.
As for pooling behind the throttle body, this is a normal condition, based on internal crankcase pressures, NOT that oil is being sucked in, but that pressures, under certain driving conditions will vent oil back through the pipe.
Please understand that there are always changes, and differing circumstances, and these should NOT be confused.
Besttoall, c4c5:eek2:
 

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c4c5

Rick,
good to hear from you.......question.......some Service Mgr's are telling ( so i have read) Z owners that this IS a problem, and they are replacing the PCV equipment located under the intake (so i hear).
This was recently told to one of THIS forum's members, that had just gottten a re-ring........and it didn't help..........so, this was the prescribed NEW method of treating the consuption issue....................300 miles per Qt........I think
:bs: :bs: Or What???????????
 
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How much would it cost to replace the rings if you were out of warranty?

Do all the 01 owners have an extended warranty?

I would imagine ..an extended warranty and very light mods would be the prudent decision?

Would long tube headers void the warranty to the point the general would be off the hook?

I still think the 01 zo6 is world class but what a pia!
 

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Pooling???

C4C5specialist,

What do you mean by "pooling" behind the throttle body not being a problem? Do you mean *oil* pooling from the PCV? If that happens, I can't see why it would **not** be a problem. Please elaborate.
 
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