This B18 is a 1.8 litres (1,778 cc) automobile Inline-four engine produced by Volvo from 1961 through 1968. The cam-in-block engine had overhead valves (OHV) operated by pushrods. The crankshaft rode in five main bearings, making the B18 quite different in design from its predecessor, the three-bearing B16. A larger 2.0 litres (1,986 cc) version called the B20 appeared in 1969. These engines are reputed to be very durable. The world's highest mileage car, a 1966 Volvo P1800, traveled more than 4,890,993 km (3,039,122 mi) on its original B18 engine.