I used to like Roadkill, but like everything else corporate sponsorship killed the soul of the show. Go back and watch the first five or so episodes, then watch the last five.
Don't even get me started on Engine Masters. Such blatant shilling for their advertisers, and I don't mean AMSOil. The flat-tappet v. hydraulic roller cam comparison was laughable: "These two cams are identical, except we gave the hydraulic roller cam an extra fifty-thousandths lift. Otherwise it would've made the same (or less) power, and people would realize what a rip-off hydraulic roller cams actually are! But the huge profit margin keeps that big advertiser money rolling in!"