Guys i have Honda civic 99 with D15b engine.i bought this car about 1.5 months ago.i recently changed oil (hevoline) n after that car starts emitting smoke in the morning for 3 4 kms and after that it stops.when u accelerate RPM above 4000 then it also gives white bluish type smoke and there is greece in silencer too.Kindly suggest what can be problems?rings problem?and one more thing car is also reducing oil.