Synthetic motor oils work great. I have used breakfree for years but last year bought some Royal Purple Gun Oil for lubing after cleaning. I did so because when I used Royal Purple Motor Oil in one of our cars it improved the mileage from 1.5 to 2 mpg every tankful. After I used up the small spray can of gunoil($9.95 for 4 oz), I tried some of the motor oil and it felt just as slick and is $6.95 a quart! I will use it from now on and a qt should last for years. God Bless.![]()