Only have 3450 mile on my 19 MDX Hybrid Adv since March 2019 with mostly city driving. Only one short trip out of town to Santa Fe (120 miles round trip) and noticed the rear seat head rests vibrating at hwy speeds. Hard to tell about alignment because of road quality (a ton of 18-wheelers wrecking the road surface) and LKAS always adjusting. Planning a drive to San Antonio for 2 week at the start of October for my first road trip and just had to double-check wheel balance and alignment. Discount Tires did a road force balance on all four and found passenger rear out of specs ($25 per tire). Firestone did the alignment and found 7 alignment points out of 14 that needed adjustment ($230 for alignment+lifetime warranty). The only thing they couldn't adjust from yellow back into the green was the rear camber and they said that was within specs with Acura.

Alignments w/ or w/o lifetime warranty isn't for everyone. I usually keep my vehicles +10 years and +150,000 miles. The road hazard/rotation/balance and alignment warranties start to pay for themselves the longer you keep your vehicle. I will find out on Monday how the MDX rides on the hwy after the adjustments.

 

Did the alignment fix your vibration problem?

 

One thing to consider here is whether Firestone's alignment machine was calibrated properly. I've seen vehicles that were aligned to factory spec on one machine be out of spec on another alignment machine.

 

Just made it into San Antonio after driving non stop from ABQ. The road force balance fixed the vibration issue I was seeing with the rear seat headrests. Really hard to tell before/after with the alignment because the roads are so varied from new to really worn with a lot of groves. I've kept lane keeping assist on because it really lightens up the steering input when driving (road departure on because I departed at 2:30am). It felt better at hwy speeds of 75-85 mph compared to my first short trip to Santa Fe. Texas state hwys are usually 2X- 5X better compared to NM state hwys.