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However, it’s not actually oil, but diesel fuel that has mixed in with the oil. One of the more infamous problems on the 6.4 Powerstroke is its weak pistons that were prone to early cracking. A cracked piston allows extra air into the cylinder, which then decreases the compression ratio. Drivers' door vin stamp will say "incomplete vehicle" if you have a cab chassis truck. Cab Chassis Trucks take specialty SCR DPF Delete pipes along with specialty EGR Delete kits. We pro