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Old 06 July 2013, 01:31   #1
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Advice on oil

I have a Mariner 30M, 30hp 2 stroke. I have been told that I do not actually need marine 2 stroke oil & that normal 2 stroke oil is good enough. Does anyone know if this is correct?
Also does anyone know the ratio of fuel/oil mix for this engine?
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Old 06 July 2013, 02:18   #2
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You must run your engine on a TCW3 rated two stroke oil.

Using other types of oil designed for motorbikes/strimmers etc can lead to serious damage to your engine as these are air cooled and designed to run at much higher temperatures than your outboard.

I wouldn't worry too much about buying a premium oil for premixing but it must meet TCW3.

I had a mariner 40 which ran on 50:1, I would imagine yours would be the same. Some premix engines can be run on 100:1 (Yamaha I think) but I would reccomend running these on 50:1 too.

Mark.
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Old 06 July 2013, 02:24   #3
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Thanks, will do
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Old 07 July 2013, 02:59   #4
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so for a 20L fuel Tank that is 400ML of oil?
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Old 07 July 2013, 03:21   #5
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50:1 = 20 ml oil per litre fuel.
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Old 07 July 2013, 07:04   #6
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Quote:
Originally Posted by keeno07 View Post
I have a Mariner 30M, 30hp 2 stroke. I have been told that I do not actually need marine 2 stroke oil & that normal 2 stroke oil is good enough. Does anyone know if this is correct?
Absolute b%ll%cks - a prime example of why you should always follow the guidance given in an engines owners manual in relation to oils etc - they are the expert not a mate or someone in a bar.

TCW means "Two Cycle Water-cooled" -- any other oil will most likely be formulated for air-cooled engines which typically have higher combustion temps. A water-cooled outboard does not generate the heat required to burn off all ordinary 2 stroke oil - especially if you aren't running at WOT most of the time.

Excess unburned oil means more and faster carbon build-up on cylinder walls, piston crowns and transfer ports. Coked-up cylinders lead to sticky rings, losted compression and therefore lost of power and maybe engine failure.

Nuff said
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Old 07 July 2013, 10:03   #7
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Absolute b%ll%cks
Nicely put couldn't have said it better myself.
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Old 07 July 2013, 17:45   #8
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My understanding is that the Marine 2 stroke is based on an ester base oil and is designed to be bio degrade able hence ideal for marine life where as motorcycle and chainsaw oil is based on mineral oil technology.

For the best Eco life for our marine life use as our colleagues say TC W3 which is a marine 2 stroke oil specification.

Hope this helps you
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