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.
Now add those two numbers together, 375 sq. ft. + 2,500 = 2,875 sq. ft. for the grand total square footage of roofing area for this roof. I recommend rounding this number up to 2,900 sq. ft. then multiplying it by 100 to convert to a square for a total of 29 squares.