Because of it's versatility, reliability, performance, and mostly importantly, it's size, the 4BT Cummins has become pretty popular in the automotive world as an engine swap for Jeeps, trucks, buggies, rock crawlers, and even the occasional little sporty car.

That being said, no engine is perfect, and while the 4BT Cummins is a very reliable engine, it's been put on pedestal by Cummins fans much like like the 12V and 24V Cummins. So, it's time we ignore all the good things about this little engine and instead look at everything wrong with it.

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