How much oil ?

[Mr.KingSpooled]

Hey raiders,

Basically just trying to figure out the best ratio of fuel to oil to run in my 94 mariner 20hp 2 stroke.

I got told by the previous owner that it should run a 25:1 ratio (25L fuel to 1L of oil) except he wasn't to sure on this n was not able to find out exactly !

What's got me worried is that alot of smaller boats running mixed 2 strokes run on 50:1 and it's also readily available on the pump (e.g Como).

But I don't hear much about 25:1 and it just seems like I'm running alot of oil through the motor !

I run 1 24L tank n basically when I do a full tank of fuel almost takes a whole 1L bottle of oil, at 25:1 that is.

I know running more is better than running less but it just seems like alot, especially on a cold start, the motor smokes up alot, but once warm n underway its un-noticeable!

But then after stopping for a fish n starting the motor up becomes smokey again n only once underway does it subside !

Also because it's an older motor is there a speacial type of oil I should run or just stick to the 2 stroke outboard stuff I see in the servos !!

Any help would be great as oil is becoming expensive having to use so much at a time where as if I was running a 50:1 ratio my 1L oil bottle would last 2 full tanks which is alot more efficient !

Cheers raiders,

Jeremy

Edited March 15, 2012 by Mr.KingSpooled

[The Incredible Hull]

I'm guessing most people will tell you to run 50:1, I do.

Put a simpler way, I personally think its better to run with more oil than less - I.e. less\leaner can cause overheating.

White smoke = ok, black smoke = too lean

[mako2000]

According to Mariner all 2 strokes are 50:1

http://www.marineroutboards.com.au/home/service--warranty/service--maintenance/fuel--oils-recommendations---outboards.aspx

[Pongrass18ft]

Fuel mix 50L unleaded to 1L of outboard oil.

Try not to mix your oil brands when topping up ( Mineral and synthetic oils )

Keep the mix ratio as close as possible to 50:1 for optimum running performance.

NOTE

Your plugs will be very,very oily running a 25:1 ratio and your rings will gum up using too much oil over time.

Plus carbon build up in your motor causing more problems.

Chris.

[onearmedfisho]

YEAH DEFINATELLY 50:1 (100ML OF OIL TO EVERY 5L FUEL) ALSO MERCURY/MARINER RECOMMEND THE QUICKSILVER BRAND OF OIL WHICH IS NOT SOLD AT SERVO'S...

Edited March 15, 2012 by one armed fisho

[Mr.KingSpooled]

Thanks for all the helpful replies raiders.

I knew it, I had a feeling 25:1 was jus too much oil !!

Well now i know the right ratio 50:1 it's starting to make things easy !!

Also I'll try and stick to one brand oil as much as possible to save from mixing too many different compounds n runnin it through the motor !

Thanks again raiders,

Happy Boating

Jeremy

[tareeterror]

Castrol super outboard plus is a good oil, as hard to get the Quicksilver stuff except from boat shops.

[GaryO]

Should perform a lot better at the correct 50:1 ratio as well