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Old 28 February 2012, 13:40   #1
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Gear box oil

whats the difference between Evinrudes gear box oil and the cheaper makes ? its for an Evinrude ficht can anyone recommend one? (thats cheaper than evinrude's) ??
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Old 28 February 2012, 13:49   #2
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Like most engine/vehicle companies none of them 'make' oil they just stick their name on an oil company's selected product. I should think any reasonable standard EP90 gear oil will be fine. I have gallons of stuff at home for my Landy's and use that in the Tohatsu.
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Old 28 February 2012, 13:54   #3
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Old 28 February 2012, 16:42   #4
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Like most engine/vehicle companies none of them 'make' oil they just stick their name on an oil company's selected product. I should think any reasonable standard EP90 gear oil will be fine. I have gallons of stuff at home for my Landy's and use that in the Tohatsu.
No it's not. Use proper marine grade gear oil. It's got emulsifiers in to take up any slight water ingress if the seals fail, preventing internal corrosion.
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Old 28 February 2012, 17:42   #5
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Happy to be proved wrong but never heard that before - Tohatsu's service manual states 'GL5, SAE 90' - ie bog standard gear oil. As I say exactly the same stuff that goes in the Landy t'fer box, diffs, swivels etc and in many other automotive/gear applications.

Not sure how much protection the emulsifiers could offer but they would be useful in a Landy - one off-roading session with hot diffs entering deep water and the water gets sucked in past the seals leaving mayonaise for lube...

Oil is always an emotive subject and as anyone who ever ventures onto various Landy forums will know there is more b****x talked about oil than just about anything and I guess it's probably the same for other popular marques, motorbikes, etc.
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Old 28 February 2012, 18:01   #6
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Old 29 February 2012, 03:40   #7
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Interesting presentation on Bio fuels, I won't be using them anytime soon, but I could not find anything relevant to marine gearboxes - have I missed something?
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Old 29 February 2012, 06:34   #8
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use a marine gear oil as it has additives that in the event of water ingression it keeps the water from metal parts, thats the idea anyway, sometimes works sometimes dont work.Which oil is best? I dont know use what ever you trust/like
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Old 29 February 2012, 11:19   #9
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whats the difference between Evinrudes gear box oil and the cheaper makes ? its for an Evinrude ficht can anyone recommend one? (thats cheaper than evinrude's) ??
I end up using the manufacturers since its only a few dollars more than cheaper stuff from the autoparts store. Is it exactly the same? I don't know but in the grand scheme of my boat costs its cheap to use the manufacturer speced oils.
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Old 29 February 2012, 17:31   #10
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I have always used the OB OEM recommended oil and last year for the first time in 40yrs of boating experienced the milky oil that results from a leak. The oil drained out almost the colour of milk and when I stripped the gear box the metal parts were perfect. For what it costs I would use a marine spec product, although I have been tempted in the past to use that high spec racing low friction oil that was given etc.
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