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Update: - I updated the TCM software at the dealership and boom; 90% of the hard shifts are gone! Thanks, Husam

Thanks for the detailed approach. Here is the update from my side: - Scan tool shows zero DTCs. - Before I flushed the transmission (the last flush out a total of 4 flushes), I added a solvent to clean/flush the varnish out; turns out the ATF was in a pretty good condition. (Solvent added: BG...

Thanks for the pointer -- but I have already ran a complete DTC check on the car and had zero codes. I even erased the AT adaptive values.

I guess so too. I'll schedule an appointment with the dealership next month to check the SW.

I've done that for a couple of times before adding any additives. I performed at last 2 flushes with OEM fluid without additives; the same behavior persisted. Adaptive values have been reset multiple times. The strange behavior is that the hard shift only happens between the 4th and the 5th...

Thanks for the pointers here. and Sorry for what happened.

Yes, I performed at last 2 flushes with OEM fluid without additives; the same behavior persisted. Adaptive values have been reset multiple times. The strange behavior is that the hard shift only happens between the 4th and the 5th gear while the ATF is not fully warmed up. This is a question...

Yes, the first flush attempt was performed without any sort of additives. The strange behavior is only seen when ATF is cold; but once warmed up, it is smooth.

What do you mean by "flaring"?

OEM ATF from Hyundai, SP-IV-RR spec

I already did this after the 1st flush of the ATF; I used OEM ATF yet the same behavior persisted. Even after all the flushes, I always OEM ATF.

Gentlemen, 2015 v6 3.8L RWD Genesis: Condition: - Mileage = About 160,000 KM. - Location: Dubai - Warranty: Expired - Car very well maintained, regularly. - All fluids changed (Engine Oil, Radiator fluid, Brake Fluid, Diff Fluid) - All filters changed. - ATF flushed 3 or 4 times with added ATF...

Shift Control Solenoid Valve C (35R/C) was replaced and the transmission shifts smooth now. However I am considering XADO additive in the next ATF change to repair any worn clutches.

I already drove over 200KMs with Lubegard. What I just did is - i have a "Launch" Scanner with me anyway - I did a live stream on a few solenoids and here are the screenshots. The culprit is Shift Control Solenoid Valve C (35R/C) which is responsible for 2nd to 3rd AND 4th to 5th shifts. I...

## Status Update ## Gentlemen, 2015 v6 3.8L RWD Genesis: Condition: - Mileage = 92,500 Miles which is about 149,000 KM. - Location: Dubai - Warranty: Expired - Car very well maintained, regularly. - All fluids changed (Engine Oil, Radiator fluid, Brake Fluid, Diff Fluid) - All filters...

I already added Lubegard Red today, and I drove for about 50KM. I noticed a very slight improvement in the shift quality from 4th to 5th gear that used to be shifting harsh. How long does it take for Lubegard to take full effect usually? Thank you, Husam

Originally Posted by ripcord Lubegard products are well regarded for this purpose. Also, adding extra magnets to the pan to grab ferrous metal particles before they reach the solenoids is something else often suggested. Will you point me to a link to the exact Lubegard product please? I could...

Thanks you gentlemen for your suggestions. I already changed the ATF fluid three times in a row (drain and fill). I will consider the following: - Lubegard Red - Seafoam transtune if they do not solve the problem (though solenoid magnet may not get cleaned i guess); i will either manually...

Gentlemen, I own a 2015 Hyundai Genesis (aka G80) 3.8L v6 with 8-speed automatic transmission. The car runs great except that it recently started to shift harsh from 4th to 5th gear. I looked it up in Genesis forums most opinions are about solenoids that may be the cause of this harsh...

Originally Posted by blufeb95 I think that BG stuff is really meant to be added to crude derived oils to increase the oxidative stability. Amsoil Signature series should be mostly PAO, f you want a more stable Amsoil next time you buy some get 10w30 instead of 5w30, the 10w30 is less volatile...