i put the bike away a few months ago. pulled the batt, stabilized the gas and changed the oil and filter. well it's time to ride and i would like to try synthetic oil. the current oil (walmart) and filter (honda) has about 5k on them. can i replace the dino oil and use synth with the current filter? now i know that there are dino/synth blends of oil and a few people change the filter every two oil changes, so i basically already know the answers but it's better to be safe than sorry, thx.