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138 Posts
I recently bought a new left-over 2017 TA 392 with A8 trans. I specifically wanted MDS as I do almost all highway driving and it will be my daily driver. I've seen several Youtubers saying the 6.4 MDS lifters wear and fail often. I've also had several people tell me in person that all manufacturers are having early failures on MDS engines, Chevy, Mopar etc. due to lifter problems. That kind of worries me and makes me think of several questions about it and if there is anything I can do to help prevent MDS causing engine failures.
1) Are all 6.4L engines going to have mechanical failure due to MDS, its just a matter of time?
2) To prevent MDS failures, is it as simple as driving in Sport Mode all the time so MDS isn't engaged? Or will the MDS lifters still fail whether being in MDS mode or not?
3) I don't plan on modifying the engine or racing the car or really beat on it any more than an occasional on-ramp pull. So my plan was to run factory Pennzoil full syth oil, SRT filter and change it every 6k. (I drive 100+ miles a day all highway and its mostly spent on cruise control) I installed a BT catch can and got maybe 1" worth of oil out of it in the first 7k miles. Is there anything wrong with just driving it like I do, change oil at 6K and don't worry about any MDS failures? I have full warranty for 75k miles so if something does fail I'd assume a full repair would be covered under warranty.
4) Or should I do 3K oil changes and take oil samples to watch for wear like some people I've read about?
One of the reasons I got this new car was to stop driving older highly modified muscle cars and sports cars as a daily driver and having to constantly do maintenance on them or watch for the next thing to break. I was hoping this car would fill the need for a powerful and fun to drive sports car yet still be new and reliable. Thank you for any input. And long live Mopar!
1) Are all 6.4L engines going to have mechanical failure due to MDS, its just a matter of time?
2) To prevent MDS failures, is it as simple as driving in Sport Mode all the time so MDS isn't engaged? Or will the MDS lifters still fail whether being in MDS mode or not?
3) I don't plan on modifying the engine or racing the car or really beat on it any more than an occasional on-ramp pull. So my plan was to run factory Pennzoil full syth oil, SRT filter and change it every 6k. (I drive 100+ miles a day all highway and its mostly spent on cruise control) I installed a BT catch can and got maybe 1" worth of oil out of it in the first 7k miles. Is there anything wrong with just driving it like I do, change oil at 6K and don't worry about any MDS failures? I have full warranty for 75k miles so if something does fail I'd assume a full repair would be covered under warranty.
4) Or should I do 3K oil changes and take oil samples to watch for wear like some people I've read about?
One of the reasons I got this new car was to stop driving older highly modified muscle cars and sports cars as a daily driver and having to constantly do maintenance on them or watch for the next thing to break. I was hoping this car would fill the need for a powerful and fun to drive sports car yet still be new and reliable. Thank you for any input. And long live Mopar!