Roadmaster Specs

The Buick Roadmaster was manufactured from the end of the Great Depression until the late 1950s. The first automatic transmission appeared in the Roadmaster 1949 and the first V-8 in 1953. In 1959, the Roadmaster was renamed the Electra, with a significant change in body style. The Roadmaster re-appeared in 1991, replacing the Estate Wagon, and appeared as a four-door sedan in 1992. Buick produced the last Roadmasters in 1996.

Fluid Levels

The station wagon holds 21 gallons of fuel while the sedan holds 23. The crankcase for both holds five quarts of oil. The transmission needs 10 pints to drain and refill, but 22.4 pints to overhaul. The cooling system holds 16.4 quarts of coolant and the rear differential holds 4.3 pints of lubricant.


The station wagon is longer, wider and taller than the sedan. With an overall length of 218 inches and a width of 80 inches, it exceeds the sedan by two inches in both dimensions. The height of 60 inches exceeds the sedan by four inches. Both have a wheelbase of 116 inches, and the wheel-nut torque specification of 100 foot-pounds.

Roadmaster Engine and Parts

The 1991 Roadmasters had a 5.0-liter engine, but in 1992 changed to a 5.7 liter V-8 engine that develops 260 horsepower at 5,000 revolutions per minute. For replacement parts, use a PF52 oil filter, an AC1096C air filter, AC 41-943 spark plugs with a 0.050-inch gap and a CV895C PCV valve. Replace the front windshield wipers with 22-inch blades and the rear station wagon wiper with a 17-inch blade.

Transmission and Seating Capacity

The 1991 Roadmasters had a four-speed 4L60 automatic transmission that upgraded to an electronically controlled version, the 4L60-E in 1994. The station wagon seats eight with an optional fold-down rear seat, while the four-door sedan seats six.