When you say bubbles - talaga bang parang boiling? Kasi kung me air pockets pa sa radiator at sa engine block normal lang kung maliit at hindi frequent. Did you try checking your dipstick - did your oil level decrease? Does the oil consistency have a milky texture (meaning parang mocca white)?

I believe na di pa nabebreak-in uli ang tsikot mo, try observing for say at least 500 kms, drive it moderately lang muna, until such a time na fully seated na ang components - say cylinder head gasket, oil seals, valves, etc.