OP stated that his savings are a little more than $1 million. Also mentioned a 60K pension and his wife's earned income.
This limited information still may not represent his net worth. Like his net worth would matter any way. We don't know his wife's pension amount, 403b balance, maybe she has her own 2 million dollar portfolio, maybe he owns two vacation homes and several apartment buildings and a killer GI Joe collection. We don't know.
OP could you please come back and list all of your assets and account balances? Please also list all of your properties, cash under the mattress, jewelry, Santa bear collection etc. so everyone who insist on critiquing your net worth and comparing it to their own will have accurate information?
It would help if you would list your spending habits as well. Please include how much you spend or waste on sailing, golf, photography, flying, travel, ridiculously expensive booze and meals out and anything else you can think of. It makes it easier for everyone to relate. If you don't do any of that stuff you might get the blessing to move forward with the car purchase.
Since very few people have answered your question I will take a stab at it. I am not retired yet so it might not mean much to you. Whenever I am about to spend a large sum of money I go through what I refer to as a wallet attack. I panic a little then I go though all kinds of calculations to make myself feel better. I usually sleep on it then think about it for a week or two. If I still feel like its a good idea I move forward. I have made hundreds of deals on equipment, real-estate, cars, trucks, motorcycles, etc. and so far I have never regretted anything.
Lets say you make the deal on the car and things go completely south in a year and you are forced to sell it. If you buy it right and it is a desirable car you will be able to sell it almost immediately if you lower the price enough. If you buy it for 53k and you have to sell it for 43k to move it quickly will the 10k really affect you? I am sure people here waste that much on travel annually and it doesn't seem to bother them like you buying a car does.