Do you have to mix oil with the gas in a chrysler 45 hp outboard boat motor?

I just bought a boat, never had one before and was wondering if I had to add oil to the gas. It is a chrysler 45 hp engine.Do you have to mix oil with the gas in a chrysler 45 hp outboard boat motor?
This completely depends on what engine you have. It may be a 4 stroke and doesnt require oil and gas mix. You can tell if you look at the cylinder head and see of there are valves. Also look if there is a place to put or change the oil.





The difference between a 2 and 4 stroke is that the 2 stroke doesnt have valves (maybe a reed valve by the carb that lets fuel air mixture go one way and not the other) It uses oil in the gas to lubricate the crank shaft.





a 4 stroke engine is like your car where you have seperate oil for the crank shaft that needs to be changed. Dont mistake this oil for the lower unit oil, which needs oil to lubricate the parts going to the propeller.





You can usually tell by the noise that the engine makes. 2 strokes sound different than 4 stroke engines. If you dont know the difference, you should ask a mechanic.





The last answer was good for the ratio of oil that you should use.Do you have to mix oil with the gas in a chrysler 45 hp outboard boat motor?
Unless your engine has oil injection, and I'm almost certain that Chrysler never made an oil injected engine, then yes, you do have to mix oil with the gas.





I use one pint of outboard oil to six gallons of gas. It's a little bit more than it calls for, but it's easier to change out a fouled plug than to rebuild an engine.





Find a book on your engine. You should be able to get a decent marine dealer to order one for you.
Mix is 50:1 ratio.


I dont know any older 4 stroke chrysler motors mine is a 1975 90HP and two stroke.


That ratio covers almost all marine motors.


http://www.csgnetwork.com/marineoilfuelcalc.html/
absolutely, chrysler quit making outboards before they started making 4 strokes