erikfig wrote in post #18357215
There's no right or wrong. It all depends what you're looking for on your images. I saw the highlights blown out on the wipe open shots. The others looks fine on your Flickr. I usually use a CPL for this kind of shooting. It removes all reflections from paint and car glass/windows.
While a CPL can be an advantage in static car shots, it can also produce some odd and distracting patterns in the windows. Auto glass will often have a plastic film sandwiched between the layers of glass for safety reasons. Typically, race cars use polycarbonate or acrylic (plastic) in place of glass. A CPL will often cause these patterns to be seen. This results from the stresses in the plastic, especially in the curved sections.
After many years shooting motorsports action, I choose to not use CPL's. Since they need to be adjusted depending on the position of the sun in relation to your shot, following a moving race car through a series of turns or even on a straight will not only potentially cause the odd patterns in the windows, but can cause the sky to look unrealistic by darkening one portion while the other is lighter. YMMV