Funny, I did kinda the opposite with my RAM.
Chrysler was running 1500 cash back if you financed through them.
First logical question: how much do you need to finance? Got 3 different answers, went with what the finance manger said: $8K (IIRC).
Second logical question: is there a minimum time to keep the account open? Again, 3 different answers, went with what the finance manager said: no.
Dealt with the F&I guy's schpeel when picking up the truck. This protection package, that warranty packaged. "no....no.....no....no thanks".
Handed him a check for the final price minus the 8K Id be financing
"sorry sir, you cant have 2 loans on the same vehicle"
"uhh, look at it, its a cashiers check from my credit union"
Needless to say, they weren't thrilled that I didn't finance 100% through them. Why didn't I? Because with my credit score of 800+, they "did me a favor" and got me 5% APR. They should know where they can go with that offer.
And icing on the cake, I paid the "loan" off after 1 month, later to find out that the dealers (supposedly) lose part of the $$$ that was kicked back to me if I dont keep the loan open for at least 6 months.
And the salesman was perplexed why I wasn't jumping for joy when I went to pick up the truck. After all the back and forth BS they gave me on the price of the truck, I just knew they had more BS left in them.