This calculator is designed to supply the area of any potential collection surface of any length and width in square feet and/or square inches, based on the length and width values entered in feet and inches, and the potential and estimated actual rainwater recovery in gallons.
It depends! Read the owner's manual for the brand of car you own or want to drive as each auto maker determines when to change the oil. Generally, I've read and experienced that full synthetic oil can last up to 5K-7500 miles, but... it also depends on other factors such as your driving style and where you live. VW has listed in its newer cars, like the 2015 VW Golf, that oil changes can be done in 10k miles!
Auto experts say synthetic oil provides the following benefits: - Long-lasting. Synthetic oil takes longer to break down and is designed to last for 7,000 to 10,000 miles or more between oil changes. Conventional oil should generally be changed every 3,000 to 5,000 miles. - Fewer trips to the auto mechanic can result in reduced costs overall for oil changes and fewer air filters.