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 the surface area of your roof, the length of its ridge(s) and the perimeter. You will also need to know the square footage of your attic. All roofing is sold by the square which is 100 square feet. Three bundles of shingles will cover one square, or 100 square feet. You may need to replace flashings around pipes, chimenies, or anything else which comes through your roof. This is not rocket science. If they are too rusty, or they look like they will leak, replace them.