[ford1]

i use 4 oz per 10 gal of fuel and 1 qt in the oil at oil change , i have a filter so i need 5 qts at every change i use 40w all year long in my 4 flathead v/8s, and heaven forbid, i change the oil every 5000 miles, for you guys that still have and read the owners manual that was given with the car when new that says change every 500 miles, i save $150 more on one oil change over what you spend in 5000 miles , i save 10 oil changes, it adds up , and yes i have over 45000 on one engine and several thousand on the others, AND no problems