have owned 6 tesla since 2012. Had my first drive unit failure on a model3 dual drive rear motor. The car is 11 months old with 6500 miles on it. Tesla replaced it in 2 days with rebuilt drive unit. I was surprised they used rebuilt part and did not extend warranty. I have no idea why the replacement part originally failed or how likely it is to fail again. Did the replacement drive unit have 5000 miles or 60,000 miles on it with original owner? When my new car warranty is up will it be more likely to fail at 6 years if it had the 60,000 miles on it before I got it? Yes I know drive units are said to last 500,000 miles but ours was clearly an example of one that didn’t. If your ICE car engine blew on a one year old car would the OEM replace it with a rebuilt engine with unknown mileage on it? They said they had no idea why it failed which makes me wonder if there is something in car predisposing it to fail. I wonder about this issue because I had heard of unusual modelS cars with multiple drive failures. I used 60,000 miles as an example but given rebuilt drive units had previously failed, it would be more likely from drives with heavy use or perhaps abuse. Is it acceptable to use used parts in warranty repairs without extending warranty on those parts?