I'd listen and go 40.... particularly if it's got some hours on it.

-W (runs 20/50 in the '68 Vette with a zillion miles)

"WaIIy" wrote in message
...

I have Mercruiser 5.7's 1989 and boat on Lake Erie near Cleveland.
My mechanic recommends straight 30wt oil and that's been fine, today he
said a new bulletin came out from Mercury and it was something like 30
wt up to 60 degrees F and 40 wt for over 60 degrees F.

Now my mechanic says to use straight 40 weight.

What do you think?

so, which "additives" make oil work in an engine used to drive a propeller are
not in oil in an engine used to drive a driveshaft?

"Gene Kearns"
Date: 10/11/2004 8:50 AM Eastern Daylight Time
Message-id:

On 09 Oct 2004 23:39:00 GMT, (JAXAshby) wrote:

Can you produce *ANY* data that oils promoted by *ANY* of the marine
engine manufacturers is unaltered, rebottled automotive oil?


That is not an answer to the question posed.

That oil grade level (SG, SH, SJ) on the bottle.

Incorrect.

SG and SH classifications are obsolete. SJ is for engines prior to
2001 and SL is for all gasoline and propane engines (using detergent
oil). SL is current for gasoline engines... both straight weight and
multi-vis (dino and synthetic).

The API "S" and "C" classifications merely address a minimum
performance level. Oil can contain *ANY* additives, meet a minimum
performance, and receive the SJ or SL classification. Thus, any sort
of additive can be added to a SL oil and if it doesn't do anything to
reduce the ability of the oil's ability to reach the spec... it is
still a legal SL oil.

--



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.southharbourvillageinn.linksysnet.com Real Time
Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats
at Lee Yeaton's Bayguide

laugh with us. tell us which major oil companies produce oil specifically for
use in 4-cycle gas engines used in a marine environment, and how that oil
differs from the same company's oil produced for the same engines used in say
highway driving.

"Gene Kearns"
Date: 10/11/2004 8:55 AM Eastern Daylight Time
Message-id:

On 09 Oct 2004 23:36:33 GMT, (JAXAshby) wrote:

As you have posted no data,

junnie, I did post data. I posted that no major oil company makes a special
oil for the marine market (save 2-cycle oils, which are not part of this
discussion).

That statement is so laughably and obviously wrong that it doesn't
merit a reply.


--



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.southharbourvillageinn.linksysnet.com Real Time
Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats
at Lee Yeaton's Bayguide

I did address that very issue the very instant you brought it up. I shall
repeat it, junnie, because you were obviously too stew ped from eating dinner
to understand. race engines are pre-lubed before startup, therefore race
engines have full oil galleys before ignition, therefore gain no advantage from
multi-grade oils.

go stand in the corner, junnie.

"Gene Kearns"
Date: 10/11/2004 9:00 AM Eastern Daylight Time
Message-id:

On 09 Oct 2004 23:34:23 GMT, (JAXAshby) wrote:


btw, race engine builders still use high price oil and still feel the money
is
well-spent even if you still don't understand why.


Why don't you address the issue. Why do they chose a single weight oil
over multi-viscosity oil?

--



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.southharbourvillageinn.linksysnet.com Real Time
Pictures at My Marina
http://www.thebayguide.com/rec.boats Rec.boats
at Lee Yeaton's Bayguide

Gene Kearns wrote:
On 12 Oct 2004 01:43:27 GMT, (JAXAshby) wrote:


I did address that very issue the very instant you brought it up. I shall
repeat it, junnie, because you were obviously too stew ped from eating dinner
to understand. race engines are pre-lubed before startup, therefore race
engines have full oil galleys before ignition, therefore gain no advantage from
multi-grade oils.



So then you admit that single viscosity oils are superior to multi-vis
oils, with the exception of pre-lubing?



The manufacturer of the twin cylinder engine on my small tractor
recommends straight 30-weight oil, as does the manufacturer of the
engine on my lawnmower. Gosh...you'd think they'd insist on multi-vis
oil...

So then you admit that single viscosity oils are superior

superior is incorrect.

to multi-vis
oils, with the exception of pre-lubing?

junnie, you are one slow learner. pre-lubing is the reason multi-grade oils
were developed six decades ago, the reason multi-grade oils are by far the oil
of choice, the reason virtually all engine manufacturers recommend multi-grade
oils going on a quarter century.

JAXAshby wrote:
So then you admit that single viscosity oils are superior


superior is incorrect.


to multi-vis
oils, with the exception of pre-lubing?


junnie, you are one slow learner. pre-lubing is the reason multi-grade oils
were developed six decades ago, the reason multi-grade oils are by far the oil
of choice, the reason virtually all engine manufacturers recommend multi-grade
oils going on a quarter century.



Wrong.

never let it be suspected that junnie has a coherant thought in his head.

Gene Kearns
Date: 10/11/2004 10:19 PM Eastern Daylight Time
Message-id:

On 12 Oct 2004 01:41:01 GMT, (JAXAshby) wrote:

laugh with us. tell us which major oil companies produce oil specifically
for
use in 4-cycle gas engines used in a marine environment, and how that oil
differs from the same company's oil produced for the same engines used in
say
highway driving.


If you have a car engine in your sunfish or is it Sunfish..... ( oh,
gawd, that's funny), my sympathies. Please don't tell the USCG..... I
think they'd give you a pass on that all chain rode, but that auto
engine? .... oh, that'd cost you....

Haven't you figured, by now, that if anybody cares about the gist of
this thread they've already googled the result and decided that you
are clueless?
Sorry, dood....

--



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

so, ----------- which -------------------- major oil companies produce a
special "marine" grade oil?

Gene Kearns
Date: 10/11/2004 10:24 PM Eastern Daylight Time
Message-id:

On 12 Oct 2004 01:38:22 GMT, (JAXAshby) wrote:

so, which "additives" make oil work in an engine used to drive a propeller
are
not in oil in an engine used to drive a driveshaft?

Oh, mygawd, that is the first intelligent post you've made!!!

There may really be *some* hope!

Think carefully, now, auto vs boat.......

RPM?
Persistent Ambient Humidity?
Running Temperatures?
Ambient Temperatures?
Frequency of Use?
Etc.?

Think about it....

--



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