OIL weight for 4 stroke 250 yamaha

[JOHNREELMAN]

What oil weight do you recommend for my Yamaha 250.
I live in Iowa if that make a difference.
will 10W30 yamalube work.
i have an oil change kit available.
thanks

[almetelo]

10W30 or 10W40 is what Service Manual recomends

[boscoe99]

Actually, you have a bit of flexibility. Here is what is depicted in a 3.3l F250 owner's manual.

Seems that 10W-30 Yamalube will be just fine.



Oil weight can be a widely debated topic. My Ford F150 pick up truck likes 5W-20 no matter what the weather. Stuff flows like water.

[robert graham]

The motors are thermostatically con*****ed/water cooled, so how critical could the oil weight be?...other than for very cold/thick oil lubrication at starting....seems a synthetic oil would be great for the cold climates?....

[seahorse5]

What model number F250 do you have?

The newer one and the original design have different oil requirements.

[boscoe99]

What model number F250 do you have?

The newer one and the original design have different oil requirements.

Folks almost never provide their model identity. Could be the conventional F250 (early model or later model), an Offshore F250 or an SHO VF250.

Not sure why he is asking for our recommendations in the first place. He should be concerned with Yamaha's recommendations. Which are published in both the owner's manual and the service manual.

[boscoe99]

The motors are thermostatically con*****ed/water cooled, so how critical could the oil weight be?...other than for very cold/thick oil lubrication at starting....seems a synthetic oil would be great for the cold climates?....

Does make you wonder. If the thermostats are doing their job then the actual engine temperature should be more or less the same irrespective of the water temperature or air temperature.

[99yam40]

Does make you wonder. If the thermostats are doing their job then the actual engine temperature should be more or less the same irrespective of the water temperature or air temperature.

But it could be a problem before motor is run long enough to get the motor warmed up, and then if things are too cold low idle RPMs may not heat it up enough.

Not a problem down here on the Texas coast most of the time and even if it does get real cold I do not plan on running a boat out on the water anyway

[boscoe99]

But it could be a problem before motor is run long enough to get the motor warmed up, and then if things are too cold low idle RPMs may not heat it up enough.

Not a problem down here on the Texas coast most of the time and even if it does get real cold I do not plan on running a boat out on the water anyway

It can certainly be a problem if people don't let their motors warm up. Ever see a bass boat guy back off the trailer, fire it up and he is doing 60MPH almost immediately. He then blames the oil if and when something bad happens.

My wife starts her car and has it is drive before it ever has a chance to idle back down. I just wince and keep my trap shut.