Reasons for Unresponsive RPM After Oil Change

[DiAnna]

The reason for unresponsive idle speed after an oil change is: changing the oil improves the lubrication inside the engine, reducing wear on internal engine components, which naturally makes the idle less responsive. Generally, the oil needs a break-in period before the RPM stabilizes. The amount of oil replaced in the car should be slightly lower than the mark on the dipstick. Excessive oil increases the crankshaft's rotational resistance, reduces engine output power, and allows the excess oil to enter the combustion chamber, leading to oil burning, blue smoke emission, and increased fuel consumption. When adding lubricating oil, it is advisable to keep it slightly below the dipstick mark. If there is too much oil, the excess can easily enter the combustion chamber (due to excessive internal pressure) and form sticky carbon deposits. Initially, there may be no noticeable effects, but over time, the carbon buildup will worsen, not only causing unresponsive idle but also clogging the catalytic converter's pores, resulting in excessive exhaust emissions (increased fuel consumption). In severe cases, it may even lead to oil burning.