I'd say stick with what you have, and if it starts to die off then get a rebuild.. I got my b18c rebuilt and it's going strong.. lol (the oil burning was just shitty running in oil :P lol doesn't like vtec) Plus it would be a cheaper option to swapping in a b18cR and you can easily get more power outa your b18c then just using a stock b18cR for less than buying just the b18cR..