I am puzzled, after I had my VVC engine rebuilt I had to put 6 litres of mineral oil in to get it to the right mark on the dry sump dip stick, I have done 1000 miles running it in and I have just drained the oil out by taking the bottom plate off the conning tower, the bottom pipe off the gold pump, the sump plug out the bottom of the dry sump and the oil filter off, turned the engine over by hand but have only got 4.4 litres of oil out, where is the other 1.6 litres hiding? Please help with my stupidity. Thanks