Just pulled my summer car out of winter storage: 1991 Honda CRX Si 1.6L 28,800 original kms (18,000mi). Oil changed June 2003 - Motomaster Full Synthetic (Shell manufactured, supposedly Type IV), AC PF1127 filter. I have put on approximately 600kms on this oil. Pulled the dipstick - oil looks brand new, smells fine. Does anyone recommend changing the oil again, or changing it before it goes back into storage again (October). What about just changing the filter?