The 2JZ is a 3.0L inline 6 engine that was produced by Toyota from 1991-2005. It is often considered to be one of the most reliable engines ever made, and many people believe it to be bulletproof. There are several reasons for this reputation.
First, the 2JZ is overbuilt. It has forged connecting rods, cast aluminum pistons, and solid valve lifters. These components are all designed to withstand high levels of stress and wear better than cheaper alternatives. As a result, the 2JZ is less likely to experience internal engine damage than other engines.
Second, the 2JZ has a very strong bottom end. The block and crank are both made from cast iron, which is incredibly strong and durable. This makes the engine much less likely to suffer from crankshaft or block failure, even under extreme conditions.
Third, the 2JZ has an extremely tough head gasket. The head gasket on this engine is made from metal, rather than paper or rubber like most other engines. This means that it can handle much higher combustion chamber pressures without blowing out.
Fourth, the 2JZ has very good oiling properties. The oil passages in the engine are larger than average, which helps to ensure that all of the moving parts are properly lubricated at all times. This reduces friction and helps to prevent wear on internal components.
Overall, the 2JZ is an incredibly reliable engine that should give its owner years of trouble-free driving . However , as with any mechanical component , proper maintenance is always important in order to keep it running smoothly .