I just got the gm paid trans service today of fluid and filter. I have 7400 miles on my"24. When I was driving home, I noticed the dash readout said filter life 99%, trans fluid 84%. Can that possibly be correct after fresh fluid today. thanks

 

The 7500 mile service is the replacement of the external canister filter, not the entire replacement of the transmission fluid.

 

The filter one should have been reset to 100%.

 

It was probably reset to 100%, but it doesn't take long to get back to 99%...

 

You don't need a fluid replacement until 3 years or 45,000 miles - whichever comes first. Also, GM doesn't pay for the DCT fluid change, just the filter. I'm sure the dealer didn't change the DCT fluid and they shouldn't have.

Engine oil and filter has different rules.

 

Maybe they did a DCT fluid flush which is part of the DCT canister filter change process but the flush in this case does not mean a fluid change (just forcing the transmission fluid to go through the DCT canister filter to collect as many impurities as possible before changing the actual DCT canister filter).

On this note, I’m a bit crazy about maintenance and given the multitude of C8 transmission failures, I changed the DCT filter at 4,100 miles, changed the filter again at 7,500 miles (required by GM) along with the transmission fluid and will change the DCT filter and fluid again at 22,500 miles (I did oil/filter changes at 4,100, 7,500 and 15k miles and I’m thinking to change to a 5k miles oil change schedule (instead of the 7,500 miles GM recommended schedule). Yes, a bit extreme on the maintenance!

 

I believe you mean 3 years or 22,500 miles.

 

No, 45K is correct. 22,500 miles is for your second DCT filter replacement.

 

Have we ever figured out exactly how the filter (not the fluid) life monitor works exactly? We know the first change is at 7500 and the second one is intended to be 15000 miles later at 22,500. But does the filter life monitor reflect that correctly. @RKCRLR started a thread about that, but I don't know if there was ever a conclusion - some reports were confusing.

Anyway, if it counts down to 0% life remaining in 15000 miles, then a 1% drop would be just 150 miles. It shows the life in increments of 1% and I don't know which way it rounds, but if it found down, then it might go to 1% after just 75 miles.

 

Also, if it's rounding down, it might start showing 99% even at 99.9%, or at anything below 99.5%..

 

Why don't you ask the dealer ??? H might actually know....

 

Just reinforcing it's a misstatement that GM says change engine oil at 7500 miles. Gee where they good highway miles or poor city miles with many cold starts and short drives? Heck that is what my Uncle, Service Manger at a large Chevy Dealer told me in the mid 1950s!

IF you read the Owner's Manual carefully it says the ONLY indicator of an oil change requirement is the OLM. That has been in place since my C6, two C7s, my 2020 C8 and now my E=Ray. IN fact my 1993 Corvette before the OLM could only use the foolish miles and time. However it noted for some driving conditions you should be CHANGING OIL AT 3000 MILES OR 3 MONTHS WHICHEVER OCCURS FIRST! See this page from my 1993 Owner's Manual:


Your lucky! The OLM is very sophisticated and does more than keep track of miles and time. It also monitors among many things like total engine revolutions, the oil temp after cold starts. AND if it does not get HOT Enough LONG Enough to evaporate most of the water of combustion that passes the cold rings. It will lower the minimum time to change oil of 12 months (which is for contamination NOT that the oil is worn out.) That water combines with things like Sulfur and forms Sulfuric Acid that eats metal when parked. Yep for some driving, 3 months is all you should leave oil in the car using what GM (Jiffy Lub and some dealers) used based on tests. Jiffy Lub and Dealer's had to guess they way you drive. The OLM does it analytically with measured information! In fact many Vette owners did not understand short drives with their car were worse than Tracking!

 

Thanks!

 

BTW, does anyone know what the 3 year DCT oil change costs... with out the filter of course.

 

It varies all over the map, depending on the dealer.

 

This is my 3 year invoice. I had just under 8000 miles so it includes the DCT Filter and engine oil/filter BUT can subtract that out. Note it was a few years ago and most paid closer to the MSRP for the DCT Fluid which was ~$45/quart.

Subtracting the engine oil/filter parts and Labor = $885.
The Labor for the Filter would not decrease very much as once the aluminum Shear Plate is off (required to drain and fill the DCT) there is little extra time required (the GM Specified Flush prior that takes ~10 minutes is the longest.)
So deducting the $232 for the Filter Kit :$885 = $653.

You'll probably pay somewhat more as most Posts showing cost of fluid from their dealer were closer to MSRP (except for folks who did their own or bought the fluid to their dealer themselves.)
Note, some who brought their own DCT Fluid to their dealer, their labor charge was more than the $298. And my $298 charge was for both the DCT Filter and DCT Fluid change.

Frankly I would never ask my great dealer if I could bring the fluid I bought from a discount retailer, letting them make a profit rather than themselves as they don't have Trained Technicians and the overhead of a repair facility!
However IF the quote is much higher, might circle the costs on my invoice and ask if there are any discounts available!