Motovista wrote:
WEB-Tech wrote:
How hot do you think the exhaust valve area gets?
How much does a henway? How much hotter do you think the exhaust valve area gets than it gets in a Honda or Yamaha scooter where they don't demand you use a very expensive grade of oil?
Honda seems to disagree with you for anything but low heat riding. And a scooter going WOT down the highway, isn't a low heat condition.
From Honda website:
"FOUR-STROKE OILS:
Pro Honda HP4S - Red bottle / silver foil label. This is the "Crown Jewel"
of the Pro Honda Oils line, our very 1st Full Synthetic 4-stroke motorcycle
oil. Pro Honda HP4S is a full synthetic 4 stroke motorcycle oil designed to bring
maximum performance to the Pro Honda line of oils. Because it is a full
synthetic, you get the following benefits:
Lower fluid friction than conventional oils.
Better oxidation resistance for better high heat performance.
Higher film strength under heat and load than conventional oil.
Quicker flow to vital engine parts at low temperature, especially during start
up.
Maximum power due to less frictional drag from the oil.
Recommended for high performance riding where vehicles are operated
under extreme temperatures.
Plus, this is not just any synthetic. It has been tested and approved by Honda R & D, and
developed by the same engineers that make the oil for the Honda Racing Team!
HP4S is packaged in red bottles with a silver foil label and is currently available in 10w30
viscosity only.
Pro Honda HP4 - Gold bottle/black and gold label. This is the top of the line
premium 4-stroke synthetic "blend" motorcycle oil and is
recommended for
all "normal" riding situations. Normal riding situations are when the
motorcycle or ATV is used as designed and is
not "lugged" or run near redline
for extended periods of time. HP4 is a blend of synthetic and petroleum base
stocks for excellent oxidization reduction, less evaporation, shear stability for
smoother shifting and less viscosity loss. HP4 does not contain moly; so
expected clutch life is longer than a moly formulated oil. HP4 is sold in a gold
bottle with black label, available in OW30 (for cold weather ATV applications), 10W40
weights.
Pro Honda GN4 - Black bottle/red label. Intended as an all around 4-stroke
oil motorcycle for normal everyday riding;
low heat applications. GN4 is a petroleum-based motorcycle 4-stroke oil recommended for scooters, ATV's and motorcycles used for light duty and low heat usage. Commuting, normal street rides, casual trail use and low engine stress situations do not cause as much heat to build up in the engine therefore a less expensive additive package can be utilized. This is our original motorcycle oil formula developed specifically for motorcycles and blended with an additive package to meet the unique shifting requirements of shared engine and transmission sump designs. GN4 is packaged in a 1-litre black bottle with a red label, available in 10W30, 10W40, 20W50 and also 5w30 weight for cold weather ATV use."
So in other words a Scooter going down the highway at top speed that is stressing the motor and creating lots of heat should not use this standard oil and should upgrade to their Synthetic Blend.
They even make the comment, "Normal riding situations are when the
motorcycle or ATV is used as designed and is not "lugged" or run near redline" that I highlighted. And that a recommendation on when their SEMI Synthetic is NOT good enough. When is a scooter not run near red line?