i have a b16a 2nd gen.. quiestion is.. is there a big deiifernece in usings a 5w-30 full syntetic oil rather then a 10 w30 or 10 40 full syn.. well say if i used 5w-30 will my v tec eventually kic more then the other options cuhz the oil is thinner right? my shit doesnt even pull that much liek my frens stoc b16a 2nd gen ..iono if its the oil too.. unless i got a bad ass beat up motor haha.. but jus wonderin any suggestions?.

you will be fine switching to the 10-30 or 10-40. switching your oil will not effect vtec.