General Motors and Tremec have issued new guidelines for 2026 and newer C8 Corvettes when it comes to having your dual-clutch transmission serviced when doing the auxiliary filter change at 7,500 miles.
According to a video from Alan Johnson of Matick Chevorlet, dealers are being told they can now skip the hydraulic flush procedure which was previously required with the filter change. By skipping this, owners could see some significant savings in labor costs which is why GM has said they have made this change.
Also, by removing this step, it eliminates the risk of contamination of the new auxiliary filter by flushing particulate matter back into the system. That’s especially true if the filter was overdue for replacement.
The letter goes on to say that fluid levels only need to be checked if there is a visible leak. However, Alan says that it’s still a good idea to pull the inspection plug and check the fluid levels anyway. He says that’s what they are doing at their dealership, so check with yours to see what exactly is being done. As the bottom pan needs to be removed anyway for the filter change, it’s easy to take a peek at the fluid levels.
While the hydraulic flush procedure is no longer needed with the auxiliary filter change, we are hearing that it’s still part of the process for when the transmission fluid is changed.
As far as we know, and Alan states this as well, there haven’t been any engineering changes between the 2025 and 2026 model year transmissions, so why does this only apply to the 2026s and newer DCTs?
Thanks again to Alan and General Motors/Tremec for sharing this update! Anything that can help save Corvette owners a few bucks during service calls is always appreciated.
Source:
Driven with Alan Johnson / YouTube via MidEngineCorvetteForum.com
Related:
GM is Making C8 Corvette Transmission Repairs Possible with New Parts Available
GM Really Wants You to Follow the Maintenance Schedule for Your C8 Corvette’s Transmission
TREMEC Just Released a Manual 6-Speed Transmission with the Same Mounting Points of the C8’s DCT
Subscribe Now:
There are numerous examples where replacement/repairs are chosen over re-engineering. Even if it means replacing the same part numerous times under warranty. Once warranty is up then the dime is on you. Seems when GM does a cost analysis, it comes out less expensive for them to just keep replacing parts, even calculating in some level of lawsuits, rather than the cost of re-engineering which is unfortunate. Some examples: LS harmonic balancers, LS7 valves, C7 wheels. Lastly, Ignition switches on several GM model cars- this one defies all logic. Instead of re-engineering a part that was estimated at 75 cents per unit, GM chose to fight and lose lawsuits that were brought about because of deaths (fire) caused by the failure, finally took an act of congress to force a recall and a re-engineered part. Thanks, Ray
Same old DCT. Next GM will say the transmission has life time fluid. M6 or M7, pull the drain and fill plugs then pump in 4 quarts of fluid. Takes more time to jack up the car.
You are stating to change DCT at 7500 miles and check fluid level at that time to visualize if there may be a leak. You are also stating there will be a significant savings by not having hydraulic fluid changed at the first 7500 miles and just check. The real significance would be if Hydraulic fluid does not get flushed every 3 years just checked at time of DCT replacement
Is the significant savings only at 1st DCT change or all the time. This is misleading!!
Dealers are stating not at first 7500 miles , but thereafter 15K, 22.5K so on!!
Comments are closed.