Hello, I had the same worries about this. So I bought the dipstick to Caterham parts for my 485 (I am french and living now in the UK). Reference: 380E0001A. https://caterhamparts.co.uk/oil-system/6968-dipstick-duratec-dry-sump-tank.html?search_query=Dry+sump&results=130 Not the cheapest, not a perfect system as you hardly can see the oil on the stick (it is a dry sump after all, not a wet one) but I now get a tool to check the oil level (with engine just warm, keeping always the same procedure). I am less worried. Alex
