There is oil on the spark plug, what effect will it have on the car?

If it is not a fault that causes the oil to enter the cylinder, but the oil is stuck on the spark plug, it will not have a substantial impact on the car if the engine is not very big. As long as the engine can be started, nothing will happen. After the engine is started, there may be a little blue smoke, but as long as the engine is started, it will burn out quickly, and then everything will be normal, and nothing will happen again. Even if a little carbon deposit is produced, it can be discharged normally.

Cars nowadays are all four-stroke. Under normal circumstances, there is no oil in the cylinder and on the spark plug. But if you accidentally get the oil on the spark plug, just clean it and install it. No problem. If the engine oil enters the combustion chamber of the cylinder for other reasons, it can be ignited without a spark plug. Although it cannot be started, the engine oil in the cylinder can be drained as much as possible, and then a spark plug can be installed for starting.

Although it may be a little difficult at first, a little blue smoke may appear after starting, but it will be normal as long as it runs for a while, and there will be no other adverse effects. If there is a fault that causes the oil to enter the cylinder and the spark plug is installed, it is necessary to find and eliminate the fault first, and then install the spark plug before starting.