Hello, for the maintenance lists for cars I know, the engine oil /+filter change is either after X km or 1 year. How do you do this with a seasonal vehicle that is only moved in the summer months (July to September) and is driven very little (less than 500km) in the year? It is clear that a good synthetic engine oil (e.g. Mobil1, Castrol, …) is not yet “consumed” here. But what about the additives in it if necessary? And the condensing was possibly collected in it. if the vehicle is housed in a garage for the rest of the year, which also allows an air exchange through the gate slots etc.? How do you do that or what do you think about it? Should you change the engine oil here every year or, for example, only change the engine oil filter every 2 years and in between after a year?