Internal combustion engines are incredibly complicated ... Blow-by occurs when compressed air and fuel in the cylinder bore is greater than the pressure in the oil pan, and fuel leaks past piston ...

your diesel engine's cylinder head and block are held together by head bolts. Normally, that's okay. Those bolts are designed to stand up to extreme amounts of pressure, and if you never separate ...

Perhaps the automaker’s best diesel engine, the BMW M57 ... heads with four valves per cylinder. Features like a graphite iron engine block and a high-pressure direct injection fuel system ...