Does an engine overhaul have a significant impact on the car?

[DeAna]

An engine overhaul does not have a significant impact on the car. The relevant details are as follows: 1. Definition of an engine overhaul: An engine overhaul refers to the complete disassembly of the engine, replacing components such as pistons, piston rings, big and small bearings, valves, timing chains, cylinder boring, crankshaft grinding, and all sealing gaskets and oil seals (diesel engines also require pump calibration), to restore the engine's performance to its factory specifications. 2. Conditions for an overhaul: An engine must undergo an overhaul when there is a severe drop in power, accompanied by phenomena such as blue smoke emission, excessive oil consumption (indicating severe oil loss), cylinder scoring, or piston knocking. After an engine overhaul, it is essential to perform a cold run-in for more than 3 hours, followed by a hot run-in for more than 2 hours.