So, flushed and dropped the oil. How much do you think came out? Over 5 liters! I usually put the old oil into the previous empty container. It nearly overflowed.
Which makes you wonder how the marks on the stick work.
I filled it slowly, checking it many times while adding a little bit each time, also taking into account the empty oil filter pot and drained cooler. Had to go back for another bottle! Lucky they were on special too. Six liters later, it is now on the top mark finally.
There must only be a liter from top to off the stick.
Not so worried anymore about oil loss either.
Gave everything a nip up and degreased and washed the engine down so it sparkles.
5W30 Fully synthetic in the belly.
Spins up faster now, and is quieter and tighter as you would expect.
All good.