I’m sure there is already a thread for this but my search couldn’t find it. Just put my 2005 Roadster back on the road this week after winter storage and was about to DIY change the oil. Checking it first I noticed it was so clean I could barely see the topped up level. This car get driven very minimally every year, only goes through 1 tank of gas before storage again. Do I really need to change it every year? Could I extend it to every 2nd or even 3rd year?