Does a diesel car with excessive exhaust require a major overhaul?

[ColeFitz]

No. Excessive car exhaust is mostly caused by engine issues. Below are the reasons for excessive engine exhaust and the corresponding solutions: Reason 1: The main cause is severe wear between the piston rings and cylinder liners. Solution 1: To prevent excessive exhaust, it is recommended to replace the piston rings and cylinder liners. Reason 2: Incomplete combustion in the engine or mechanical engine failure, such as severe wear of the cylinder liners and pistons, excessive clearance between the cylinder and piston, etc. Excessive clearance between the cylinder and piston allows too much engine oil to enter the cylinder, and excessive oil in the oil pan. During splash lubrication, a large amount of oil enters the cylinder. High-temperature gases in the cylinder enter the oil pan, contaminating and thinning the oil, which affects lubrication and leads to excessive exhaust. The fuel system, intake system, and fuel injectors not being regularly maintained can result in carbon deposits and sludge buildup. Solution 2: The remedy is to have the vehicle inspected and repaired at a maintenance shop.