Too much oil consupmtion in combustion engines may have different reasons, e.g.:
(a) oil leakage via piston / piston rings
(b) oil leakage via valve guides
(c) oil leakage through sealings, e.g. at the crankshaft
Approaches for reduction are:
ad (a): optimized clearance of piston and cylinder wall, cylinder and piston surface treatment, materials of piston and cylinder, piston ring design
ad (b): optimized tolerances at the valve guides, application of valve shaft sealings
ad (b): proper sealings (especially at rotating parts)
Kind regards,
Mario
In addition to what Mario mentioned make sure not to over fill the sump with oil when changing oil and do proper filtering so as not to allow abrasive material from reaching cylinder surface.
Too much oil consumption is due to many reasons:
1) Cooling system. If cooling system is not working proper then it would result in rise in temperature of water. So, mix a coolant with water.
2) Also by lubricating system. Some of the fuel is absorbed by the lube oil at the space between cylinder and the piston. Temperature of lube oil should be maintained for this purpose other wise it would affect the viscosity of the lube oil and due to which it starts in absorbing more fuel then the normal. Also check the cooling system of lube oil
3) Check the oil rings. otherwise it would also result in increase in the consumption of the fuel.
4) Check the spark timing of the fuel. It should be properly tunned otherwise unburnt fuel may goes into exhaust.
5)Also check the carburetor. If it is not working proper then in case of excess fuel may result in more un-burnt fuel in the exhaust and in other case for more air results in misfire which also result in un-burnt fuel in the exhaust
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