Firstly it should be mentioned is that if you find your oil levels are depleting then it is either down to oil consumption or an oil leak.
Oil consumption is the 'burning off' of oil in the engine and is common in older vehicles or ones which have been subject to high mileage. Commonly this is caused by worn valve stems and seals, and worn piston rings which allows the oil to slip into the combustion chamber where it burns off. If this is happening you may see wisps of blue-ish coloured smoke coming from the exhaust. Oil consumption is almost certain to happen as the vehicle ages. You can maybe even expect to see some consumption occur if your engine requires an oil with particularly low viscosity, 0W/20 for example.
More after the jump...
Oil consumption is the 'burning off' of oil in the engine and is common in older vehicles or ones which have been subject to high mileage. Commonly this is caused by worn valve stems and seals, and worn piston rings which allows the oil to slip into the combustion chamber where it burns off. If this is happening you may see wisps of blue-ish coloured smoke coming from the exhaust. Oil consumption is almost certain to happen as the vehicle ages. You can maybe even expect to see some consumption occur if your engine requires an oil with particularly low viscosity, 0W/20 for example.
More after the jump...