265 lbs of uncrushed oil filters in a 55 gallon drum.
55
55 US gallons = about 208.197 liters.
-- You can put as much or as little as you want to into a 55-gallon drum, as long as you don't exceed 55 gallons. -- A "barrel of oil" is not a 55-gallon drum. It's 35 imperial gallons, which is approximately 42.5 US gallons. (So the price of oil by the barrel is even higher than it sounds.)
55
80-90 Gear oil
.55 liters
55 gals
55 x 2.6 = 143
There are 34.97 Imperial gallons per barrel of oil.
V=(πD2/4)h where D is the diameter of the 55 gallon drum and h is the height of the oil. Or if you prefer V=(2πr2h where r is the radius of the drum and h is as above.
55 gallons X 2.6 oz = 143 oz.