To answer your questions:
1) Who cares? It's trivial. If the expense of the business cards is enough to trip you up, you've got bigger problems to focus on.
2) Double-check the spelling. (You misspelled "brake fluid" above.)
3) Choose a name that will resonate with your customers. Make sure it's easy to say and spell. And, try to get one with an available domain name.
3) Ideally, the name should describe what you do (or at least symbolize it), or be incredibly memorable.
It takes a while to come up with a good name. Spend the time necessary to pick the right one.
First, the serious ones (stupid ones to follow)
Parts Smart
Parts Mart
Car Gutz
Purr-fect Auto Parts
The Autocrat (or The Auto-Crat)
The Auto-Dialler
The Auto Loader
Now, as promised, the ridiculous ones (the ol' reverse-psychology trick of telling your customers you're serious by giving yourself an un-serious name)
Mister Smarty-Parts
Major Partz
Underhoods
Captain Sparky
The Great Crate
Heap o' Fixin's
Drivin' Monkey, The Car Parts Junkie
I Heart Parts
Mister Friendly's Autocracy
Sloppy Jalopies
I am distributing to mechanics. I'm not sure if they'll enjoy Autocrat automotive supplies, despite the fact that I love that one. It's actually very smart.