Originally Posted By: sayjac
Obviously, you think it's neccessary and think it works. Not to sound stupid, but what/where is the biggest advantage?
It really helps preventing your undercarriage from rusting. Fasteners don't seize, brake lines and fuel lines don't rust out, and most parts won't rust at all. However, everything will be covered in oil, and it is MESSY when you work on your car.
The other big advantage is it helps prvent the body panels from rusting from the inside out. They spray inside all body panels, and they literally stay coated with oil. Things like rocker panels, lower fenders, quarter panels edges all last much longer when "Krowned." But again it's messy, it drips out water drain holes and can make a mess in the door jambs.
That said, I can say living in a VERY salted area, with long winters, oil spray rust proofing works without a doubt. In fact, when I bought my truck, a big selling point for me was that the previous owner Krowned it. Now at 16 years old with over 200 K miles (many of those salty winter miles), this never garaged truck is rust free. I can say the same about my brother's '86 Cutlass Supreme (and if you know these cars, you also know they are very rust prone).