MRHTRD

Getting ready for track season and had some of my fluids changed in the 16 Z06 Z07.

Changed out the Dot 4 brake fluid and changed out the rear end gear lube.

When I came in tonight to pick up the car, there was a jar partially filled with my gear lube and a large amount of metal shavings just for good measure sitting on the counter.

My mechanic is thinking that it is from the bearings.

Ok, so who has experienced this and what can I expect on down the road ?

Mechanic says that in no way shape of form should this be happening to this car.

I track it about 6 to 8 times per season.....and have run primarily Cup 2's.
Thanks,
MRHTRD

robert miller

Do you still have a warr on the parts that have not be modded also with gm lube. Is so take it all in to the dealer if no warr then if it has not broken go race it. Some metal id the normal on trans & rear but if has more than what should be in the jar. Then you can pick up a used one for 1500.00 max.

Plus with all the flood cars that was out in TX should be able to pick up one used in excellent cond. Robert

ersatz928

I is normal for new diffs to shed some fine silver metal particles into the gear oil, when they first break-in, for maybe the first 1000 miles. After that, the gear oil should stay pretty clean.

MRHTRD

This car has just turned 14,000 miles and the gear oil was jet black with a lot of silver tint to it. I would say we have a bit of an issue........

robert miller

Had you ever chged it out before this. I really dont think GM are any other big place put good stuff in the cars. I chged my rear end stuff out at less than 7,k car had never been tracked are nothing. It was really black dark with very little silver tint in it.

I use AMSOIL syn in all my stuff that holds fluids. Used it in my per say race car c5 always looked like new. chged stuff out ever 7500 miles in trans & rear. 3,k miles on the oil in the motor.

ersatz928

No, I would say you have an issue if you change the gear oil now, and 1000 miles later you have metal particles in it.

bsedwebt

I agree about the break in with lots of dark gear oil and shavings - totally normal. I have seen this in my other cars as well. That is why I change my diff oil at about 1K miles on new cars. The last few cars I changed at 1K miles were very nasty - so much so I went to do it again at 5K miles and they were still clear and good to go at 5K miles so I left them alone from that point forward and always good. Of course I used full synthetic in those cars. This time I had the dealer do it with the GM fluid at 1K miles as well as the initial oil change for the same reason. Small price to pay for peace of mind.

mcoomer

I had my fluid changed at the first oil change because I'd heard about some folks finding theirs underfilled when serviced, and to get out any particulates that might be in there. I'd go with what others are saying that some particulates are normal but if you had a bunch in there...not good. Maybe dump it again in 2000 miles and see what's in it then?

ersatz928

I did my first diff oil change at 800 miles, it was silvery....yesterday I did another diff oil change at 6000 miles...slightly silvery.....I think I will do one more change at 12,000 miles.

dbaker

I did the same.

New gears breaking in.I do this change every time I get a new car.....plus mine was low.

\db2

C6_Racer_X

Ring and pinion sets shed a lot of metal shavings as they "break in." That's one reason that most manufacturers recommend a diff/rear end lube change early, then extended intervals. Most also have a magnet somewhere to catch the metal that wears off the ring and pinion.

You don't say how many miles are on this one, and you don't say if this is the first time the diff lube has been changed. If mileage is under 30,000 and this was the first diff lube change, then I'd say it's normal as long as it's all powdery or "whiskery" shavings. If there are any big chunks in there, that's a problem.

Custom Corvette Accessories

^^^^
This


Change and check again in 5000 - should be reduced by about 90%

Getting ready to do mine when I hit 10K and expect the same

Been that way on every Corvette I have ever owned...

Regards
Chip

Bill Dearborn

Since you track the car did you follow GM's diff fluid guidelines for tracked cars? The Om recommends changing diff fluid after first track event and then change every time you reach 24 hours of track time on the car. Given the typical HPDE with 4 20 minute sessions per day that means the fluid should be changed approximately every 18 days of track time.

That maintenance recommendation is far above the typical street/highway driving recommendation where the OM doesn't say much at all.

Bill

djnice

That is how it looks at 1,500 miles on these diffs. That's why everyone changes it in the first 500 to 3000 miles.

Sellout

I've never actually seen gear lube that wasn't silvery. At least a little bit.

If the oil just looks metallic, you're fine. If there are solid chunks you have a problem...