That really depends on the engine type, any wheel weights and ballast (water in tyres). They're roughly 5,000lbs or 2,300kg, 'dry'.
http://www.tractordata.com/farm-tractors/000/7/4/746-massey-ferguson-165-dimensions.html
What year is a massey ferguson 165 with a serial number of 37786240?
a 165 Massey-ferguson oil pan holds 8 1/2 quarts
1974 http://www.tractordata.com/farm-tractors/000/7/4/746-massey-ferguson-165.html
1973
The weight of a Massey Ferguson 285 tractor is approximately 5,500-6,000 pounds.
The Massey Ferguson 165 tractor with the serial number 9A47957 was manufactured in 1970. Massey Ferguson tractors typically have serial numbers that can be decoded to determine their production year, and the "9A" prefix indicates it was built in that year.
in the oil filler hole
1974
Filter is inside the tank.
1971
The power steering can not be adjusted on a Massey Ferguson 165 tractor. Check to make sure the hydraulic reservoir is full. This is usually the cause of most steering issues.
that would be 1968