You know the really funny part about the ratings is the low number is
established or set at 40C!!!! The top number is set at 100C.

We think of the 10 or 5 weight number as being thinner oil at -40C or
below 0F, Not above 40C!

Man I am in Canada and we use Celsius or the 'C' in the temps.

40C is really freaking hot!!!

If you look here, it shows what the standards mean:

http://auto.howstuffworks.com/question164.htm

Mike

herman wrote:
>
> just for fun..
>
> most crotch rockets run about a 10w-40, or 15w-50 synthetic mobile 1 red
> cap. since bikes arn't used below 0 degrees. and 15w is still good down to
> around -10C or -5C.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:407557E6.37758518@sympatico.ca...
> > You are sort of correct.
> >
> > The best oil for not deteriorating is a straight weight oil. The closer
> > the numbers are, the better the oil lasts. So a 20W30 is a more stable
> > oil than say a 0W30.
> >
> > I would think like you say, the less work chemically is has to do to
> > have the right thickness the better.
> >
> > But then we change oil long before it wears out 'usually'. ;-)
> >
> > Mike
> >
> > Del Rawlins wrote:
> > >
> > > In <40747D6D.84B59490@sympatico.ca> Mike Romain wrote:
> > > > Or hot.... Just better for cold.
> > > >
> > > > 30 is 30 when hot and that is what either oil is rated for at 100C.
> > >
> > > If I am remembering correctly from when the aeroshell rep spoke with the
> > > aircraft engine class I took a year and a half ago, he said that
> > > multigrade oils start out as base stocks the weight of the smaller
> > > number. I.E. a 5W30 is actually a 5W oil which has had "stuff" added to
> > > it to make it thicken to 30W as it heats up, and the 10W30 starts out as
> > > a 10W oil. All else being equal, since the 10W30 starts out thicker it
> > > will work better at warmer temperatures. Or something along those
> lines.
> > >
> > > I don't really understand the mechanism but the point is that 30 doesn't
> > > necessarily equal 30 where multigrade oils are concerned.
> > >
> > > ----------------------------------------------------
> > > Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
> > > Remove _kills_spammers_ to reply via email.
> > > Unofficial Bearhawk FAQ website:
> > > http://www.rawlinsbrothers.org/bhfaq/

 

You know the really funny part about the ratings is the low number is
established or set at 40C!!!! The top number is set at 100C.

We think of the 10 or 5 weight number as being thinner oil at -40C or
below 0F, Not above 40C!

Man I am in Canada and we use Celsius or the 'C' in the temps.

40C is really freaking hot!!!

If you look here, it shows what the standards mean:

http://auto.howstuffworks.com/question164.htm

Mike

herman wrote:
>
> just for fun..
>
> most crotch rockets run about a 10w-40, or 15w-50 synthetic mobile 1 red
> cap. since bikes arn't used below 0 degrees. and 15w is still good down to
> around -10C or -5C.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:407557E6.37758518@sympatico.ca...
> > You are sort of correct.
> >
> > The best oil for not deteriorating is a straight weight oil. The closer
> > the numbers are, the better the oil lasts. So a 20W30 is a more stable
> > oil than say a 0W30.
> >
> > I would think like you say, the less work chemically is has to do to
> > have the right thickness the better.
> >
> > But then we change oil long before it wears out 'usually'. ;-)
> >
> > Mike
> >
> > Del Rawlins wrote:
> > >
> > > In <40747D6D.84B59490@sympatico.ca> Mike Romain wrote:
> > > > Or hot.... Just better for cold.
> > > >
> > > > 30 is 30 when hot and that is what either oil is rated for at 100C.
> > >
> > > If I am remembering correctly from when the aeroshell rep spoke with the
> > > aircraft engine class I took a year and a half ago, he said that
> > > multigrade oils start out as base stocks the weight of the smaller
> > > number. I.E. a 5W30 is actually a 5W oil which has had "stuff" added to
> > > it to make it thicken to 30W as it heats up, and the 10W30 starts out as
> > > a 10W oil. All else being equal, since the 10W30 starts out thicker it
> > > will work better at warmer temperatures. Or something along those
> lines.
> > >
> > > I don't really understand the mechanism but the point is that 30 doesn't
> > > necessarily equal 30 where multigrade oils are concerned.
> > >
> > > ----------------------------------------------------
> > > Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
> > > Remove _kills_spammers_ to reply via email.
> > > Unofficial Bearhawk FAQ website:
> > > http://www.rawlinsbrothers.org/bhfaq/

 

You know the really funny part about the ratings is the low number is
established or set at 40C!!!! The top number is set at 100C.

We think of the 10 or 5 weight number as being thinner oil at -40C or
below 0F, Not above 40C!

Man I am in Canada and we use Celsius or the 'C' in the temps.

40C is really freaking hot!!!

If you look here, it shows what the standards mean:

http://auto.howstuffworks.com/question164.htm

Mike

herman wrote:
>
> just for fun..
>
> most crotch rockets run about a 10w-40, or 15w-50 synthetic mobile 1 red
> cap. since bikes arn't used below 0 degrees. and 15w is still good down to
> around -10C or -5C.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:407557E6.37758518@sympatico.ca...
> > You are sort of correct.
> >
> > The best oil for not deteriorating is a straight weight oil. The closer
> > the numbers are, the better the oil lasts. So a 20W30 is a more stable
> > oil than say a 0W30.
> >
> > I would think like you say, the less work chemically is has to do to
> > have the right thickness the better.
> >
> > But then we change oil long before it wears out 'usually'. ;-)
> >
> > Mike
> >
> > Del Rawlins wrote:
> > >
> > > In <40747D6D.84B59490@sympatico.ca> Mike Romain wrote:
> > > > Or hot.... Just better for cold.
> > > >
> > > > 30 is 30 when hot and that is what either oil is rated for at 100C.
> > >
> > > If I am remembering correctly from when the aeroshell rep spoke with the
> > > aircraft engine class I took a year and a half ago, he said that
> > > multigrade oils start out as base stocks the weight of the smaller
> > > number. I.E. a 5W30 is actually a 5W oil which has had "stuff" added to
> > > it to make it thicken to 30W as it heats up, and the 10W30 starts out as
> > > a 10W oil. All else being equal, since the 10W30 starts out thicker it
> > > will work better at warmer temperatures. Or something along those
> lines.
> > >
> > > I don't really understand the mechanism but the point is that 30 doesn't
> > > necessarily equal 30 where multigrade oils are concerned.
> > >
> > > ----------------------------------------------------
> > > Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
> > > Remove _kills_spammers_ to reply via email.
> > > Unofficial Bearhawk FAQ website:
> > > http://www.rawlinsbrothers.org/bhfaq/