Walter sells his Pontiac Aztec in S05E04 Fifty_One. The same day he "leases" himself and Walt Jr. new cars.
First of all, I don't understand Walt's motivation to sell the car.
1. Why sell the car when the garage owner/mechanic made it clear that the car was good for at least another 200,000 miles?
Moreover, he proceeds to sell the car for as little as $50, that too in front of his son. Now that is supposed to raise some questions.
2. Why sell a car that was in perfect road conditions, with more or less, 200,000 miles in it as low as $50?
Wouldn't selling the car at such throw-away price(hell its not even throw-away, its ludicrous) bound to attract undue attention, not to mention the 2 new cars Walt "leased" that day?
I understand that this is meant to portray the callous nature and swagger Walt has developed after eliminating Gus Fring. But this action in particular is stretching it a little too far, IMO.