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Old 09 August 2015, 12:16   #21
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,804
Originally Posted by ShinyShoe View Post
I totally get that. But if this time your mix turns out to be more like 45:1 or 40:1 and your plugs are oiling and so next time you are a bit tight on the oil to reduce the risk of oiling, but a dodgy measure anyway means you are now at 60:1 which is a bit lean causing more wear and tear.

I'm sure 125ml rather than 126ml is fine. Afterall how did you measure the petrol volume to match up... Although fuel pump at a filling station is -0.5% to +1% accurate.
It's very complicated for no reason don't mix into part filled tanks have a spare tank a Jerry can will do do a mix in the Jerry and fill your tank from that if you don't use it stabilise for next time/season most tanks have a fill line which states how many litres fill to that and add oil

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Old 23 August 2015, 09:55   #22
Country: UK - Wales
Town: Cardiff
Length: no boat
Join Date: Aug 2014
Posts: 939
You can use these CNS Power Tools Ltd Measuring Jug For 25l Mixing (00008810182)

but mixing 10l of petrol at a time assuming 50:1 is easy (most oil bottles have 50ml graduations on the side) 200ml of oil just buy 10l of petrol and put 200ml oil in and shake.....

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Old 23 August 2015, 11:48   #23
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,779
I just keep a box full of kids 250ml lemonade bottles in the garage pre-filled with a measured dose of oil and grab a few when needed. Full to brim (measures 270ml) does 20l petrol, 1/2 full does 10l petrol.

Quick simple easy.

75:1 (1 litre needs 14ml oil)

5 litres needs 70 ml
10 ……..…… 135 ml
15 ……..…… 200 ml
20 ……..…… 270 ml
25 ……..…… 340 ml

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