Quote:
Originally Posted by franque
Rotella isn't JASO MA certified, because it's an oil for diesel trucks, it just happens to work well. Just run 10-30 or 10-40 motorcycle oil, that's the oil that Honda specifies, and they're Honda clones. You're over thinking it.
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Incorrect. Rotella T4 and T6 both show the JASO ratings right on the bottles and on their website as well.
Quote:
Originally Posted by ChopperCharles
No real benefit of synthetic, and big detriments IMO. Most synthetic is too thin. 5W oils are great for motors that are specifically designed for them. Zongshen bikes are not. 5W synthetics are made for high performance machines with very tight tolerances... which is not what the Chinese are producing at present.
Charles.
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A bit of wrong here. A couple of benefits to synthetics include higher lubricity without the need for friction modifiers and molecular stability under higher stress conditions.
Most synthetic is too thin? The viscosity rating disagrees with you. 5W viscosity is 5W viscosity, regardless of if it is synthetic or mineral oil. That rating is literally how well the oil flows due to its "thickness" or more specifically it's ability to flow due to internal friction.
As far as 5 weight being too thin for the motor... that depends on the air temp. Plus, we need to consider that we are not running straight 5 weight, but a multiviscosity oil. It behaves as a 5 weight when in cold conditions, hence 5W, W meaning "Winter." Once hot, the oil will then behave as the other half of that viscosity rating (30, 40, etc). So a 5W-40 will be thinner at 32 degrees than a 15w-40, but at 200 degrees they will both behave as a 40 weight oil.