b18b burning oil

CALI-BEAR-DA9

CALIFOOLYA RAIDER
i recently swapped a 97 b18b into my 91 da its been about 2 months, the motor has roughly about 100k on it and i just noticed that i might be burning some oil reason why is cause theres some balck suit on my rear bumper... could this be my rings or what could cause this also just had a valve job done to it and my exhaust guides replaced cause had bad guides on cyl. 3 and lost compression.. i would appreciate any tips or suggestion on this thanks in advance...:thumbs up
 
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