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Oil viscosity and power question

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Has anyone used 10/30 synthetic then changed to 15/50? And if so, have you felt a loss of power. I have been running 10-30 for 15K miles on the street with no problems (as of yet).

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Being the DRZ is a dry sump, roller bearing engine, oil viscosity drag is a insignificant issue. And... because it is roller bearing engine, it is happier with a thicker oil.

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I ran 10-30 Amsoil for a few changes until I heard about crank bearing failures with 10-30. I switched to 20-50 Amsoil and when its cold (below 40 degrees), it definitely feels thick for a while until max temperature... I would have to believe there is a little more drag on the motor with the 20-50 but only until the motor is totally warm. At full temperature, any measureable power loss would be very very minimal to me but totally worth it to not have a chance of failure.

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