junnie, the manufacturer of the engine used in mercruiser conversations
recommends multi-grade oil. mercruiser is not the engine manufacturer.

"Gene Kearns"
Date: 10/14/2004 9:30 AM Eastern Daylight Time
Message-id:

On 14 Oct 2004 01:22:56 GMT, (JAXAshby) wrote:

junnie, go argue with the engine manufacturers. 100 years of experience for
them and you with 1/2 year's experience repeated 18 times.

Gene Kearns
Date: 10/13/2004 5:41 PM Eastern Daylight Time
Message-id:

On Tue, 12 Oct 2004 21:10:30 -0700, "rmcinnis"
wrote:


I can't tell you how its different, and I suspect that the only difference

is the word "MARINE" on the bottle, but Pennzoil sells a Marine oil.... :

http://www.pennzoil.com/products/mar...ycleHDoil.html


It's a shame that you did Jax's homework for him. Now he will never
learn. He won't find the correct figures and post a retraction of his
fallacious argument.

Anyway, since you did, check out the spec sheet for that particular
oil:


http://www.pzlqs.com/Tech/Pdsheet/Do...ils/pdf/Pennzo
ilMarineMotorOil.PDF

Note that the 30W oil has a lower viscosity index at 40 degrees C than
the 10W-40... it pumps quicker. This bears out the folly of what Jax
has been posting about "pumpability" and multi-vis oils. Also, note
that the 40W oil has a higher viscosity at 100 degrees C than the
10W-40... thus, more protection... less likelihood of boundary
lubrication.

Another notable benefit of the single weight oils is higher flash
point.

Note that low temperature pumping and viscosity are only recorded for
the 10W-40 oil.... that is what the "W" means... it has been tested.

The multi-vis oil does have a lower recorded pour point, so for those
of you boating at temperatures less than -38 degrees F, I suggest you
adopt that oil. Otherwise use the straight weight like the
manufacturer suggested...

What is the last sentence I wrote? I'll give you a hint, it is the
sentence immediately above this one.
--



Grady-White Gulfstream, out of Southport, NC.

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