2 cycle oil tolerance

[SweeperForce]

Hello,
What is the margin of error when mixing 50:1 two cycle outboard oil. If I need 12.8oz for 5 gallons and I put in 12.5 or 13oz will I have problems?
The example above is about +/-2%. The motor is an '89.

Thanks,
Tom

 

[ezmobee]

Re: 2 cycle oil toleracce

Re: 2 cycle oil toleracce

It's pretty good. I wouldn't worry about it. Heck OMC was saying to use 100:1 in their motors for a number of years and then changed it back to 50:1 not because of damage while running but because parts weren't lubed well enough to prevent rust during storage. Those measuring containers they sell at Wal-Mart that show the amount to mix for the different ratios and number of gallons sure make it a LOT easier.

 

[trendsetter240]

Re: 2 cycle oil toleracce

Re: 2 cycle oil toleracce

I think the margin is quite wide. As mentioned above, omc used to say 100:1 (yamaha still does for it's smaller outboards).

In my experience I mix between 40:1 and 60:1 on a regular basis. There are usually times when I want a full tank but only have enough oil on board for a 60:1 mix. No problem. And other times when the tank gets full but doesnt need the last ounce or two of oil in the bottle. I dump it in anyways and get a 40:1 mix or so.

The safe range is probably closer to 25:1 to 75:1 for regular usage. I wouldn't mix at 100:1 myself.

All this is from personal experience not any recommendations from the OEM.

 

[john from md]

Re: 2 cycle oil tolerance

Tom,

Buy the oil by the gallon. Bass Pro has a sale on from Feb 26 to March 14 or 16 or something and they have Pennzoil on sale. This way you won't have to worry about your mix. These engines run at 5000 RPM and suffer stress if the mix is not correct. It may take a while to show but why take a chance.
If you mix 50/1 all the time you won't have to worry about a bearing failure when you are out on the lake.

John