I have a 2005 Max w/ 152K miles that experiencing occasional shudder in slow/stop go traffic; its usually below 30-40 mph buildup that I feel the shudder. When up to speed, is fine. Currently don't have any leaks that I can observe. Just wondering what the board's experience with using these additives to alleviate some of the symptoms

https://www.autozone.com/motor-oil-a...ssion+additive

https://www.autozone.com/motor-oil-a...ssion+additive

https://www.autozone.com/motor-oil-a...ssion+additive
https://www.autozone.com/motor-oil-a...ssion+additive

Any reccommendation? Thanks in advance

 

I’ve, personally, never been an advocate for the use of motor oil and/or transmission fluid additives. They can temporarily improve a symptom, but do nothing to address a cause.

In your case, I’d encourage you to change your fluid, drive the car for a couple of, maybe a few, hundred miles, then change the fluid again … do this at least twice … meaning: change —> drive —> change.

 

A couple years back my truck was doing the "rumble strip" vibration on the highway that torque converter clutch issues cause, I replaced the trans filter and fluid which didn't really help then I tried the red tube of instant shudder fixx the 2nd link you posted has, within a couple days of daily driving the vibration/shuddering stopped and 2 years/50,000km later it hasn't come back. I'm not a huge fan of additives but I didn't want to pull the trans and the stuff fixed it completely

 

I'll give the Instant Shudder fix a try....these things are relatively cheap and see what happens

 

I went ahead and added SeaFoam TransTune and been generally happy with the results within the first 100 miles or so. Been in stop/go traffic and the RPMs have not revved up when applying gas to pick up speed. So far so good, but we'll see if it lasts