promised to repair anything wrong with the car (except for tires) and owners were provided with a toll-free telephone number to the company, as well as a free loaner car if a warranty repair took overnight. This backing also included mechanical upgrades to increase durability and quality, such as the standardization of electric windshield wipers on all model lines, replacing AMC's vacuum-powered units, as well as better interior trims. By focusing on quality, the smallest domestic automaker was profitable in 1972, earning US$30.2 million (the highest net profit achieved by AMC since 1964) on $4 billion in sales. The base Ambassador DPL model was canceled, with three body styles now available in SST and Brougham trim. Fleet purchasers could order plain Ambassadors in Police Pursuit Vehicle (PPV) or Special Service Package (SSP) versions. A six-cylinder engine was no longer available; thus, Ambassador became an exclusively V8-engined car for the first time since 1964. This made the Ambassador the only volume-produced American car that included air conditioning, power brakes, automatic transmission as well as a V8 engine as standard equipment; all while being priced less than the Big Three's full-sized cars. The base engine was the with two or a versions optional. The engines were designed to operate on regular-grade, low-lead, or unleaded types of gasoline. All were based on the engine designs responsible for AMC winning the 1971–1972 Trans-Am Series. The BorgWarner transmission was replaced by the "Torque-Command" (TorqueFlite) three-speed automatic sourced from Chrysler. Styling changes on the 1972 Ambassador were minimal and consisted of a new crosshatch cast metal grille with bright trim and new integrated fender extension mounted side marker lamps on the front. Brougham station wagons included a roof rack, rear air deflector, as well as 3M "Di-noc" woodgrain trim on body sides and tailgate. A Popular Mechanics magazine survey after driving a total of found Ambassador owners were pleased with their cars, describing them to be "very comfortable to drive and ride in" with handling listed as a top "specific like" by half of the drivers. A very high percentage (92%) would buy one again. Although the Buyer Protection Plan was listed by only 8.5% as a reason to buy an Ambassador, owners valued the smaller AMC dealers that "had more time to be courteous and to pay personal attention to customers". 1973 The SST models were dropped from the line, as all 1973 Ambassadors now