The only downside to that is that it actually hurts your credit score to not have a car loan. Yes, it makes no fucking sense, but that's how credit works.
Mind explaining how that is remotely possible? Payinig in cash is anonymous... how would the credit company know whose credit score to ding?
You FICO score may be lower if you don't have a history of pay money to banks.
I pay cash for everything, and found that when I wanted to finance a portion of an older yacht I just had to find a lender who did a manual credit review instead of blindly using a FICO score. I've found lenders who only use FICO have terrible customer service in any case.
When I bought my house, I had no credit cards and only the paid off boat in my credit history. I had no problems getting a loan. None. I'd saved for a down payment, was buying within my means and had a stable work history. i.e. I looked like someone who could pay back the loan I was asking for. That's all you need.
Also - go to a credit union. JSC here in Houston is wonderful if you're in the area. You don't have to work at Nasa.