it is normal for a newly overhauled engine to burn a little bit of engine oil like the previous responses. you are supposed to use a lighter grade of oil just like what they use at the assembly plant and don't add anything to the engine oil during break in. the additives will just prolong your break in period. don't accelerate abruptly and avoid high revs until after break in of about 30,000 km. it is safer to be at full level or lower than to have overfilled engine sump for diesels. if it is over serviced with engine oil, there is a big probability the engine will run wild ( runaway engine) until it blows up. the excess oil will get sucked up to the intake and serves as fuel even if you shut the diesel fuel supply off.