[THEFERMANATOR]

Go to most any marine parts house or supply house, purchase the mixxing botyle thats marked for how much oil for how much gas. If you think you're going to need say 25 gallons, add enough oil for 10 gallons, then put 10 gallons of gas in, oil for 10, then 10 gallons gas, then oil for 5, 5 gallons of gas. You're better off to have a little extra oil than not enough. I like to work in no more than 10 gallon increments so as to reduce the risk of adding way to much oil. Yes, it's 50:1 for that engine. It's going to smoke at idle without vro, just not much you can do about it. Be certain your t-stats are good, working, and your bypass valve is good and properly functioning as well. If that engine runs too cold, it will load up like no tommorrow on 50:1 mix. I like pennsoil semi synthetic myself. Great oil that clings really well to leave a lasting film during storage. Mercury oil smOkes like a SOB at 50:1