Zef wrote

So to start the first thing ive noticed is you're over exposed.
When shooting a white/silver vehicle at the time of day (roughly noon-2pm based off the shadows) the light is hitting the top of the vehicle and will not b distributed as nicely.
Most of the light will be on the roof, hood, front fenders, and trunk so to compensate drop your exposure down a bit to pull some of those harsh whites.
On to focus, focus is really the main make-it or break-it for subject in photos.
I feel image 3 could have benifited a lot from an equal frame distribution of the grill and to have the badge in focus.
Most of your focus is good but you have a very deep DOF, I would recommend using an aperture of 4.2ish in this scenario it would bring the exposure down,
give you a bit less of a DOF and wouldn't force your shutter-speed too far down.
The framing on image 2 and 5 are good but the rest could use a lot of work.
The first image seems a bit odd to me as the angle you are crouched at and the door being open it just sort of ruins the body and eye lines of the car, very few times when shooting cars do you want to go head on (mostly with newer German vehicles).
I may be a nitpicky bastard but the last photo is rightfully distracting with all the fingerprint marks on the screen, not sure if your buddy is a car guy or if this was spur of the moment but always have any screen or glass wiped down well and any gloss paint washed before shooting. You will see a massive difference in how light affects a clean vs. dirty car.
And lastly if you plan on shooting cars, always take a walk around the car and observe the factory design style. If you are working with american, the tend to have sharp cuts and distinct body lines, where as a German vehicle often times has the look and lines of the vehicle being all one panel, where as Japanese cars are a mixed bag.
So just keep in mind working with the car and letting it do the modeling work instead of trying to force a shot.