I own 1999 CRV, engine code B20B8. According to my knowledge B20B8 is the B20 type sold in Australia. I'm not rue how it relates to the engines B20Z3 sold in US at the same time. One difference I'm aware of is that my B20B8 has ODB-1 diagnotics only (i.e. a single upstream oxygen sensor only), because ODB-2 compliance requirements were introduced in AU from 2003 only. However, I think most of other emmission controls in my B20B8 should be the same as in other B20 engines.
I used to run my CRV on regular unleaded fuel (sold here at 91 octane rating) until recently when they introduced 10% ethanol blend (called E10), and they are phasing out regular 91 which is harder to find nowadays, so I started filling with E10 more and more often.
Recently I've read that not all cars (esp older) are suitable for etahnol blend. In which case fuel injectors and/or emmission controls may be damaged. So I rang my local dealer asking if my B20B8 is suitable. He told me they didn't test it yet and recommended switching to premium fuel (95 octane) if regular is not available but avoid E10.
My question is: having run my car on E10 against dealer recommendation for about half a year and 10,000km right now, what kind of damage could I have done to the engine? Have anyone experience type of trouble ethanol blend can bring to B20 type of engine? If so, can I still rectify mine by putting some fuel injector cleaners or such into the next tank?