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.
A 5/12 pitched roof (10' from eave to top of roof) x 26 x 46.5 = 1,415 sq.ft. = 16 Squares which incls. waste and dormer estimate (a Square = 10'x10'...100 sq.ft.). You could go with 15 Squares and order more if needed.