Increased viscosity
If the engine oil is not changed, it can become more viscous, which may cause the car to accelerate poorly. The accelerator pedal may not respond immediately, and the car may struggle to gain speed.
Decreased lubrication efficiency
Engine oil helps to lubricate the metal parts of the engine and reduce wear and tear. If the engine oil is not changed, its lubrication efficiency will decrease, causing increased internal parts wear and tear.
Increased noise and emissions
Overdue engine oil changes can cause the engine to work harder, resulting in more noise and increased emissions. The car may also consume more oil than usual.
Higher repair costs
Not changing the engine oil can lead to the accumulation of sticky scale deposits on the internal parts of the engine. If these deposits are found on the camshaft, repairing it can be very expensive, costing tens of thousands of baht. This is much more expensive than the cost of changing the engine oil regularly.