If you mean blueish smoke getting out of the exhaust then it sounds like piston rings are worn out (normally this is a symptom after 150000km and above) if you mean that theres oil around the outtakes of the engine then something gone wrong with the planing of the top cover; with the tightening of the top cover bolts ex wrong sequence or with the fitting of the gasket...
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If you mean blueish smoke getting out of the exhaust then it sounds like piston rings are worn out (normally this is a symptom after 150000km and above) if you mean that theres oil around the outtakes of the engine then something gone wrong with the planing of the top cover; with the tightening of the top cover bolts ex wrong sequence or with the fitting of the gasket...