specifications. If your vehicle was originally charged with R12 refrigerant, for example, the oil type specified, 'mineral', will not apply. Additionally, General Motors issues Bulletin # 02-01-39-004B replacing PAG 150 oil with a lower viscocity oil.
The term square in reference to roofing materials refers to 100 square feet of roof area. One square of slate is the amount of slate that it takes to cover 100 square feet of roof area. A 10 foot x 10 foot section of roof would equal one square. So would a 4 foot x 25 foot section. Ditto for a 5 foot x 20 foot.
Measure your roof. You need the Square feet. Width x Length. Roofing felt comes in 100 Square foot rolls. Now don't fall into the trap of using your building dimensions as your square footage for the roof measurement. You have to measure the roof itself because of the overhangs and the pitch of the roof (pitch is the angle of the roof).