Keep car or switch to an older one

Hello everyone!

I have been fortunate enough to receive my mums old 2006 Nissan. Its a small little car great on fuel even though it's old. There isn't any major issues with it so far.

The only thing is that I already have a car, it's a 2007 Suzuki grand vitara. I bought it from a private dealer just after covid and it's been a hassle since. 6 months In and there was a major fuel filter issue, warning lights keep turning on, for a 2 hour drive it takes a half tank of fuel. It has rust on the inside too and the paint is spider cracking. It has been a lemon

I don't have the funds to pay for both. So I can only have one

My question to you all is 1. Should I switch and go to mums old car?