yet, yo-yo, the fact is the statement was made that multi-grade oil tickens up
at ****very high temps*****
AAAAAAAAAAAAAAAANNNNNNNNNNNNNNNNNNNNNNNNNNNDDDDDDD DDDDDDDDDDDDDD this is a
reason to use single weight oil.

sorry, dood, but single weight oils thicken up under the very same very high
temps, so the arguement is specious (look up the word).

that is also true of single weight oils, but you knew that didn't you (you
being a service manager and all)?




The discussion that you interupted concerns mult-grade oils.

Bill Grannis
service manager

On Sat, 09 Oct 2004 05:54:19 GMT, WaIIy
wrote:

~~ snippage ~~

I appreciate you thoughts and agree, it's just that I don;t have
definitive information on exactly what Mercury recommends for what
temperature.
Ps for some other posters, my engines are FWC.

I don't mean to be offensive here, but you have the basis for making a
solid decision on this.

Right from the Mercury web site:

What type of oil should I use? Can I use synthetic oil?

To help obtain optimum engine performance and to provide maximum
protection, we recommend the use of Mercury Precision 4-Cycle 25W-40
Marine Engine Oil. This oil is a special blend of 25-weight and
40-weight oils for marine engines. If not available, a good grade,
straight weight, detergent automotive oil of correct viscosity, with
an API service rating of SH,CF/CF-2 may be used.

In those areas where Mercury Precision 4-Cycle 25W-40 Marine Engine
Oil or a recommended straight weight oil is not available, a
multi-viscosity 20W-40 or, as a second but less preferable choice,
20W-50, with API service ratings of SH,CF/CF-2 may be used.

IMPORTANT: The use of non-detergent oils, multi-viscosity oils (other
than Quicksilver 25W-40 or a good quality 20W-40 or 20W-50), synthetic
oils, low quality oils or oils that contain solid additives are
specifically NOT recommended.

The table below is a guide to crankcase oil selection. The oil filter
should always be changed with the engine oil.

AIR TEMPERATURE
Oil Type

All Temperatures
Mercury Precision 4-Cycle 25W-40 Marine Engine Oil

Below 32? F (0? C)

SAE 20W

32-50? F (0-10? C)
SAE 30W

Above 50? F (10? C)
SAE 40W


This crankcase oil recommendation supersedes all previously printed
crankcase oil recommendations for MerCruiser gasoline engines. The
reason for this change is to include the newer engine oils that are
now available in the recommendation.

Older owner manuals, service manuals and other publications that are
not regularly updated will not be revised to show this latest engine
oil recommendation. Current owners manuals, service manuals and other
service publications that receive regular updates will receive this
revised recommendation the next time they are updated.

Hope that helps.

Later,

Tom

"Beware the one legged man in a butt
kicking contest - he is there for a
reason."

Wun Hung Lo - date unknown

"Short Wave Sportfishing" wrote in message
...

we recommend the use of Mercury Precision 4-Cycle 25W-40
Marine Engine Oil. This oil is a special blend of 25-weight and
40-weight oils for marine .

What crap! If you blend 25 and 40 weight oil you don't get 25w-40 you get
an average viscosity of the two oils based on their ratio. MM's 25w40 is
formulated the same way everyone else's mulit-weights are. They start with
a base 25 and add polymers (assuming that it's dino oil).

"JAXAshby" wrote in message
...
yet, yo-yo, the fact is the statement was made that multi-grade oil
tickens up
at ****very high temps*****
AAAAAAAAAAAAAAAANNNNNNNNNNNNNNNNNNNNNNNNNNNDDDDDDD DDDDDDDDDDDDDD this is a
reason to use single weight oil.

sorry, dood, but single weight oils thicken up under the very same very
high
temps, so the arguement is specious (look up the word).


Guys... oil does not thicken when you heat it up.

On Sat, 09 Oct 2004 20:06:26 GMT, "DanO" wrote:


"Short Wave Sportfishing" wrote in message
.. .

we recommend the use of Mercury Precision 4-Cycle 25W-40
Marine Engine Oil. This oil is a special blend of 25-weight and
40-weight oils for marine .

What crap! If you blend 25 and 40 weight oil you don't get 25w-40 you get
an average viscosity of the two oils based on their ratio. MM's 25w40 is
formulated the same way everyone else's mulit-weights are. They start with
a base 25 and add polymers (assuming that it's dino oil).

I will readily admit that I don't know a lot about this, but your
contention was my understanding - base twenty five and on from there.

However, sometimes you get marketing idiots who don't understand
anything other than the fact that they are very overpaid to do what
they do which is changing and redoing "concepts" and this may well be
one of those times. :)

Take care.

Tom

"The beatings will stop when morale improves."
E. Teach, 1717

On Sat, 09 Oct 2004 17:38:16 -0400, Gene Kearns
wrote:

On Sat, 09 Oct 2004 20:14:39 GMT, Short Wave Sportfishing
wrote:

On Sat, 09 Oct 2004 20:06:26 GMT, "DanO" wrote:


"Short Wave Sportfishing" wrote in message
...

we recommend the use of Mercury Precision 4-Cycle 25W-40
Marine Engine Oil. This oil is a special blend of 25-weight and
40-weight oils for marine .

What crap! If you blend 25 and 40 weight oil you don't get 25w-40 you get
an average viscosity of the two oils based on their ratio. MM's 25w40 is
formulated the same way everyone else's mulit-weights are. They start with
a base 25 and add polymers (assuming that it's dino oil).


They probably start with a viscosity near 25, but the point is that
25W is a relative number used to rate the "crankability" of an engine
at low temperatures. A base stock, somewhere between SAE40 and SAE25
is employed and pour point depressants are added to make the oil shear
at lower temperatures.... thus the engine spins easier.

At 100 Deg C 5W-40, 15W-40, and SAE 40 should be in the same kinematic
viscosity range. At cold temperatures.... the lower the W number the
easier the engine will crank... single weight will (obviously) fare
the worst.

Note that the amusing point is that this specification doesn't address
pumpability.... as one poster here steadfastly believes. For
pumpability, one should reference the Borderline Pumping
Temperature... which gives the minimum temperature at which you may
expect adequate flow through your engine.

You know - in between the other BS, you glean nuggets of wonderful
information.

Neat info.

Later,

Tom
-----------
"Angling may be said to be so
like the mathematics that it
can never be fully learnt..."

Izaak Walton "The Compleat Angler", 1653

junnie, you are babbling. wanna know what the men/women who build extreme
performance race engines use? It goes $10 to $15 a quart, and they are happy
to pay the price.

the word ------------ can --------------------- has no meaning in this
discussion. Probably the easiest way to determine the validity of any claim
that one oil is better suited for the marine environment than another is to ask
yourself if the major oil companies make different oils for the marine market
than they make for the markets using the same base engines. If there is a need
in marine engines that doesn't exist in the same engines used in the non-marine
market those guys know it and are more than happy to make a special oil and
sell it at a special price for a special profit. If large oil companies think
is is the same, you can bet one is the same.

this ain't rocket science. oil company engineers aren't stupid.

Gene Kearns
Date: 10/9/2004 2:32 PM Eastern Daylight Time
Message-id:

On 09 Oct 2004 03:07:23 GMT, (JAXAshby) wrote:

Marine Oil is boutique oil and ---------------------------- can
----------------------------------- have an additive package tailored
to the marine environment

why on Earth would anyone believe that? The world
-------------------------------- can ----------------------- turn in
figures
eights, but does it?

If an outside force acted upon the earth in a prescribed manner, the
earth *would* turn in figure eights. Given that there are many
different bottlers of oil (as opposed to one earth), do you feel that
it is equally impossible that oils contain different additives? That's
a stretch, even for you.

Any bottler of XYZ oil (marine, or not) has the option of putting any
sort of additives into the oil they deem fit. Since there are numerous
re-packagers of oil (as well as oil producing concerns), it would be
impossible to give *one* answer to this general question.

There certainly are additives that could enhance the performance of
oil destined for high operating RPM, high ambient humidity, relatively
low operating temperatures... things that automotive oils may well
perform, but haven't been tailored to excel.

Do you have any DATA to refute this?

--



Grady-White Gulfstream, out of Southport, NC.

http://myworkshop.idleplay.net/cavern/ Homepage
http://www.southharbourvillageinn.com/directions.asp Where Southport,NC
is located.
http://www.thebayguide.com/rec.boats Rec.boats
at Lee Yeaton's Bayguide

agreed.

we recommend the use of Mercury Precision 4-Cycle 25W-40
Marine Engine Oil. This oil is a special blend of 25-weight and
40-weight oils for marine .

What crap! If you blend 25 and 40 weight oil you don't get 25w-40 you get
an average viscosity of the two oils based on their ratio. MM's 25w40 is
formulated the same way everyone else's mulit-weights are. They start with
a base 25 and add polymers (assuming that it's dino oil).

junnie, why is it you think "viscosity" is in any particular way different from
"pumpability"?

Gene Kearns
Date: 10/9/2004 5:38 PM Eastern Daylight Time
Message-id:

On Sat, 09 Oct 2004 20:14:39 GMT, Short Wave Sportfishing
wrote:

On Sat, 09 Oct 2004 20:06:26 GMT, "DanO" wrote:


"Short Wave Sportfishing" wrote in
message
...

we recommend the use of Mercury Precision 4-Cycle 25W-40
Marine Engine Oil. This oil is a special blend of 25-weight and
40-weight oils for marine .

What crap! If you blend 25 and 40 weight oil you don't get 25w-40 you get
an average viscosity of the two oils based on their ratio. MM's 25w40 is
formulated the same way everyone else's mulit-weights are. They start with

a base 25 and add polymers (assuming that it's dino oil).


They probably start with a viscosity near 25, but the point is that
25W is a relative number used to rate the "crankability" of an engine
at low temperatures. A base stock, somewhere between SAE40 and SAE25
is employed and pour point depressants are added to make the oil shear
at lower temperatures.... thus the engine spins easier.

At 100 Deg C 5W-40, 15W-40, and SAE 40 should be in the same kinematic
viscosity range. At cold temperatures.... the lower the W number the
easier the engine will crank... single weight will (obviously) fare
the worst.

Note that the amusing point is that this specification doesn't address
pumpability.... as one poster here steadfastly believes. For
pumpability, one should reference the Borderline Pumping
Temperature... which gives the minimum temperature at which you may
expect adequate flow through your engine.

--



Grady-White Gulfstream, out of Southport, NC.

http://myworkshop.idleplay.net/cavern/ Homepage
http://www.southharbourvillageinn.com/directions.asp Where Southport,NC
is located.
http://www.thebayguide.com/rec.boats Rec.boats
at Lee Yeaton's Bayguide

DanO, it does at _very_ high temps, above 300F. That wasn't part of the
discussion (and needed have been part of the discussion) until some poster
incorrectly stated that only multi-grade oils did this. It is a probable with
all petro oils.

yet, yo-yo, the fact is the statement was made that multi-grade oil
tickens up
at ****very high temps*****
AAAAAAAAAAAAAAAANNNNNNNNNNNNNNNNNNNNNNNNNNNDDDDDDD DDDDDDDDDDDDDD this is a
reason to use single weight oil.

sorry, dood, but single weight oils thicken up under the very same very
high
temps, so the arguement is specious (look up the word).


Guys... oil does not thicken when you heat it up.