Wet Sumping - Solved ?
I had my M3W for a year with no wet sumping issue - at this stage it was running the oil used by the supplying Morgan dealer and was serviced before purchase (second hand at 7000 miles).
I serviced the car myself after the first year having done another 3000. I used Motul fully synthetic V twin oil of the correct grade. After not using the car for a couple of weeks I noticed a leak and initially panicked but having read the threads on here realised this was simply a wet sumping issue. The oil level in the tank had dropped by a litre or two but on starting it was back to normal.
Ever since then if I leave the car for over a week, the leak returns - which is the sump filling up and leaking through seals/gaskets somewhere. No oil leaks in normal use and if run regularly.
My theory is that the new oil has some slightly different properties that either allow it to leak back down the line into the engine (through the oil pump in reverse?) or the sumnp fills up anyway and the new oil is better at getting past seals etc. Either way it is a nuisance.
Maybe a change of oil to another brand would fix it ?
The solution I have now adopted is to drain the oil from the header tank if the car is not going to be used for a week or more. Initially I did this with a manual pump of the type used over here for filling paraffin stoves from a big container. But I have now purchased a small 12v oil pump from LIDL 15 Euros which is meant for doing car oil changes. This makes it quick and easy to drain the oil into a bottle ready for re-use. I wouldn't use the pump for a normal car oil change as I think it is important to get any rubbish out of the borrom of the sump, but for this job it's perfect.
