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Old 01 May 2005, 12:26   #1
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Country: UK - England
Town: NE
Boat name: RedGazelle
Make: Gemini GRX420 SIB
Length: 4m +
Engine: Mariner 40 2s
Join Date: Nov 2004
Posts: 105
Pre-mix ratio for 2000 2cyl 2str 40hp Mariner?

The Mariner user's guide that I have states a premix ratio of 50:1, but the official looking quicksilver sticker on the engine states 100:1. I have always gone for 50:1 as thats what I've always used in outboards.

100:1 seems a pretty low ratio - is there any reason why my model may need less oil? I spend most of the time at high revs and change plugs frequently, so fouled plugs arent too much of a problem, but I am concernened for the long term health of my engine- will the 50:1 cause overheating in the pistons and am I wasting oil?

As always a choice between the lesser of two evils - grateful for a steer as to the right choice!

Thanks

Ed
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Old 01 May 2005, 15:34   #2
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Country: UK - England
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Boat name: Rotary Rescue
Make: Pacific 22
Length: 6m +
Engine: Mermaid 160
MMSI: 235021725
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Posts: 328
Mix

50:1 no probs stick with it.
Paul
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Old 04 May 2005, 17:05   #3
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Country: UK - England
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Make: Delta
Length: 4m +
Engine: Mercury
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We reccomend 50:1 for Commercial use and 100:1 for lesuire use. If you put loads of hours on your engine a year probably stick with 50:1 if not i would use 100:1 it will half your oil bills!!!
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Old 07 May 2005, 12:03   #4
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Country: UK - England
Town: NE
Boat name: RedGazelle
Make: Gemini GRX420 SIB
Length: 4m +
Engine: Mariner 40 2s
Join Date: Nov 2004
Posts: 105
100:1 it is then!

Thanks for the advice...

Ed
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