TopLexus35

Hi my es350 with 37k miles has a vibration on the highway, more noticeable on smooth blacktop type highways. Notice it getting around 70-80mph+. Had new Michelin primacy mxv4 tires installed by discount tire. Same tires as my OEM. 17in rims. 3 times they balanced, each time seemed better but still had vibration. Took it to Lexus. They roadforce balanced and inspected, no vibration or faults found by them. Discount tire then replaced the primacy’s with another set of primacy mxv4. This set, you feel more of the road, not as isolated as the first set. Went back again for balance, it was greatly improved on certain roads but still there on the highway. Took to Lexus, car was there for 3 days, no abnormalities found in suspension, brakes, steering or drivetrain. They rebalanced but the vibration is still there. They can’t reproduce it, which I confirm with the test drive with the tech. Any tips or help? Discount said we can try another set of the mxv4 or a different brand. No torn boots or anything under car, Lexus said they can’t fix the car if not broke.