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TOPIC: Re:yamaha maintance
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Aussie John (User)
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yamaha maintance 1 Month ago  
I have just put a new thermostat in my Yamaha 60hp 4 stroke outboard and its oil change time as well, Now I know oils ain't oils but I have a new bottle of Castrol magnetic 10/40, API SN/CF then it has ACEA A/B3,A3/B4 , I have tried researching the difference in outboard oils as the outboard runs at 50c or 125 f, but its hard to get a definite answer so I will throw the question to the oilmen, Thanks John.
 
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Re:yamaha maintance 1 Month ago  
Not an oil guy but do you have access to the factory recommended oil? I know they formulate their oil to help the power trains make the warranty period so that just means its probably one good choice. I don't always stick to that either but use some other oil around as you're doing. I read that as long as the oil is rated FC-W for four stroke outboard it should be fine. Has the Castrol got that rating? I think they're also climate graded oils for outboards.
 
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Last Edit: 2017/10/15 12:16 By ctkog.
 

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Re:yamaha maintance 1 Month ago  
I went to the boat shop and bought 4 litres for $40 of special Yamaha oil
 
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Re:yamaha maintance 1 Month ago  
Wow!! She better run like a champ
 
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Re:yamaha maintance 1 Month ago  
with a new oil filter from the yammi shop as well and a $7 thermostat it will go Yamee Ha Ha
 
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Re:yamaha maintance 1 Month ago  
You DEFINITELY want to use the factory oils in small engines. A few years ago, (15 years ago) the car manufacturers went to the oil manufacturers and asked them to remove about 17 chemicals that could cause damage to the 3 way catalytic converter. You NEED these chemicals in your oil to prevent engine damage, (or at least premature wear). Marine engines cool and heat rather quickly and the oils are designed to help with lubrication under these conditions. Oil pump speeds and volume are designed to properly lubricate without causing too much hydraulic drag which can actually cause premature wear. There was an engineer staying up late at night with a calculator figuring out the best way to get the most hours out of that engine. I wouldn't vary from the original oil unless you have a really good reason to do so and have done a lot of studying. I replace Ford 5.4 engines all the time because customers are not using the original Motorcraft filter. Also remember: Friends don't let friends buy Fram!
 
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