i just changed my oil after taking bike out of winter storage (3 months) spectro total synthetic 15/50w and trump genuine filter bought 4qt.s (4liters) only added 3 then ran bike cooled it down checked it then added maybe 1/2 of the last quart making total of maybe 31/2 liters or a little less rode bike for about 50 miles checked it with bike on centerstand seems ok maybe a little high but before it was low seems the half liter was just enough what do you think out there in triumph land ??