Not overly clear? I'd use rather less polite words to describe the very unhelpful language used by Caterham to describe this important datum! If you look into the dry sump tank with the engine off - yes, off - there are two horizontal baffles each with a large central hole, arranged vertically one above the other. Dependent on the oil level you may of course see either one or two baffles - or no baffles at all if the oil level is above the uppermost baffle. The upper of the two baffles is roughly mid-way up the oil tank, which may go someway to explain the handbook's reference to the correct oil level being approximately "... 5mm below the middle baffle level..." You will now think "Ah, got it. It's easy. All I have to do is to take the oil tank cap off with a hot engine and, with the engine running, shine a torch in there to see where the oil is, and I'm looking for the level to be 5mm below the hole in the upper baffle. Piece of cake!" Wrong! It's nearly impossible to see the level. Once you shine your torch in there I find there's virtually no way you can get your eyes into a position where you can squint past your torch to see with any confidence where the level is. At best you get a monocular glimpse of a "boiling" mass of rapidly circulating oil thrashing around. So, good luck and please let me know if you find a way which allows you to confidently check your oil level. I'm rather hoping someone has come up with a mod which will allow an accurate check without the need to take half your car's bodywork off which of course includes the need to lie on the - probably wet and dirty! - ground to do this. Anyone, please? Michael