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!
Another one of the best synthetic motor oils, in addition to the aforementioned Amoil, is the Mobil 1 10W-30 Full Synthetic Motor Oil 6-Quart Case ($34.47 via $12 mail-in rebate and free shipping, a low by $18; expires October 31), which will set you back just $7.75/quart.n the early '70s, AMSOIL brought the first synthetic automotive motor oil to market, and it's still considered to be one of the better oils for diesel motors. As such, a gallon of the Amsoil Synthetic Blend 15W-40 Heavy Duty Motor Oil ($26.40 with $11.84 s&h) is the original synthetic motor oil.