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Old 28 September 2004, 08:30   #1
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Engine oil

Hi
Can any one tell me what is "Break in Oil" Ive been reading the engine hand book (johnson 115 2004)And it says Change break in lubricant after 10 hours to 4 stroke synthetic 10w-40. Also is there any difference between castrol magnitec 10w-40 synthetic (for cars) and a can that says "Johnson Ultra 4 Stroke Synthetic"
Graham
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Old 28 September 2004, 08:38   #2
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Modern synthetic oils are very, very "slippery". For an engine to bed in properly there must be some amount of wear to lap in the mating surfaces. If the oil used during this period is too "good" then the wear doesn't take place and the components glaze and burn. BMW motorcycles are notorious for this behaviour and take ages to bed in properly. If any one tries to run them on a synthetic oil from new they are, effectively, mis-treating their engines through "kindness"...
Hence using a specific oil during the break-in period, which is not so "slippery" and may also contain extra detergents.
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Old 28 September 2004, 08:39   #3
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Old 28 September 2004, 08:50   #4
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Thanks Nick
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Old 28 September 2004, 08:54   #5
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Old 28 September 2004, 09:39   #6
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Oi!!! Graham! I've only just noticed your listed occupation.... and you're asking about "break in" oil?........
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Old 28 September 2004, 09:43   #7
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Quote:
Originally Posted by Jono
Oi!!! Graham! I've only just noticed your listed occupation.... and you're asking about "break in" oil?........

Makes you wonder, probably better at flogging you a battery!
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Old 28 September 2004, 12:50   #8
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Just to confirm what Jono's said I was chatting with the top engineer at the Yamaha stand at the boat show and he said what ever you do dont use synthetic oil !!! alway use none synthetic oil.
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Old 29 September 2004, 12:38   #9
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Since this thread is about lub oils just to let you know that I have embarked on a missions to find the cheapest TC-W3 oil possible.
So far I have found Castrol Marine and Valvoline Marine both less than half of what major makes cost to buy per litr.
However, the question that makes me think is the oil spec and compatibility. So, does any one know whether these two types of TC-W3 oil types are compatible to Quicksilver?
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Old 29 September 2004, 12:55   #10
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The W in oil stand for water use I believe. I think the Oil has different properties because the engines work in very different ways. I believe Car engines have cylinders which mostly operate in a vertical plane ( albeit canted over a bit with V block) and Boat engines mostly operate in the Horizontal plane.

I am no expet but I asked my trusted outboard mechanic ( who doesn;t sell oil) and he said always use proper marine OIL. shell nautilus is OK and can be found at reasonable prices
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