Hello All,
I have 2001 4.3 Liter Mrecruiser I/O. I know all the Merc manuals all
say use only the Merc brand oil, but I want to know if using Mobil 1
synthetic will be better for the engine (since it is in a Blazer or S-10!!)
I know Merc wants to sell oil, but are there any cons to using synthetic
instead of the Merc dinosaur juice? Thank you in advance.

Jerry

JP wrote:
Hello All,
I have 2001 4.3 Liter Mrecruiser I/O. I know all the Merc manuals all
say use only the Merc brand oil, but I want to know if using Mobil 1
synthetic will be better for the engine (since it is in a Blazer or S-10!!)
I know Merc wants to sell oil, but are there any cons to using synthetic
instead of the Merc dinosaur juice? Thank you in advance.

Jerry



It won't be worse or detrimental. It will cost more... but not much in
the big scheme of boat ownership.

It could provide better protection in severe service or extended storage.

5W-30 would be adequate, 15W-40 too. I've used both in our antique inboard.

Rob

JP wrote:

I have 2001 4.3 Liter Mrecruiser I/O. I know all the Merc manuals all
say use only the Merc brand oil, but I want to know if using Mobil 1
synthetic will be better for the engine.

Received the following e-mail from a fellow at Mercruiser. He was
relaying information he received from their oil specialists in Fond du
Lac.

There has been quite a discussion about whether Quicksilver oil is
multi-viscosity or not. The following speaks for itself:

Quicksilver 4-Cycle marine engine lubricant is a specially blended oil
which is intended for use in our MerCruiser products. This is not an off
the shelf automotive tvpe lubricant but is specially formulated to
incorporate the features needed to satisfy the unique operating
environment of marine products.

Quicksilver oil is classified as a 25W40 multiviscosity lubricant. The
multiviscosity properties are obtained by blending very special base
stocks eliminating the need for the synthetic polymers commonly used to
give automotive lubricants their multiviscosity properties. Quicksilver
oil is a Newtonian fluid which means that the viscosity does not change
with the rate of flow. Automotive oils using a synthetic polymer to make
a 10 weight base oil have the added viscometric properties of a 30 or 40
weight oil are called non-Newtonian fluids. The viscosity does tend to
change with flow rate due to the "shearing" or breaking apart of the
long "strands" of the polymer. There are some polymers which experience
permanent shear loss resulting in a subsequent change in viscosity.

Mercruiser products are designed to operate at very high speeds and
loads when compared to a passenger car. These extreme operating
conditions can shear the polymers used in some automotive oils. The
result is a dramatic loss in oil pressure and potential engine damage.

To eliminate this problem and still provide a lubricant capable of being
used throughout a range of operating temperatures and conditions.
Quicksilver 25W40 is formulated without any polymers. The requirements
of a marine lubricant extend beyond the need to penform well at high
speeds and loads. Extended periods of idle or trolling create the need
for the oil to continue to function even when diluted with fuel and
moisture. Quicksilver 25W40 has a unique "marine" additive package to
deal with the potential problems caused by these operating conditions.
Some of the polymers used in multiviscosity oils are hygroscopic (water
gathering) and form a light brown emulsion usually observed in the
crankcase breather areas. The marine environment, being very "wet" tends
to accentuate this problem. Emulsified polymer is no longer available to
help the 10 weight base oil maintain 30 or 40 weight properties.

--
Skipper

Harry,
For a year you have been wishing the real Skipper would grace us with his
presence. Now that he has, you "pretend" it is not Dave Mann. If you
really want to know, give Dave a call, or send him email to the address he
used 2 yrs ago.

You haven't done either, because you know this is the real deal. You have
gotten your wish.



"Harry Krause" wrote in message
...
Gene Kearns wrote:
On Wed, 12 Oct 2005 20:09:24 -0400, Harry Krause
wrote:

Skipper wrote:
JP wrote:

I have 2001 4.3 Liter Mrecruiser I/O. I know all the Merc manuals all
say use only the Merc brand oil, but I want to know if using Mobil 1
synthetic will be better for the engine.


Received the following e-mail from a fellow at Mercruiser. He was
relaying information he received from their oil specialists in Fond du
Lac.

There has been quite a discussion about whether Quicksilver oil is
multi-viscosity or not. The following speaks for itself:
\

I suppose if you are trying to "fake" being Skipper, there are many of
his cut and pastes moldering around, like this one. Which was posted a
dozen times by Skipper in his attempt to show he knew something about
boats.

So true. If you google up the prior posting of this nonsense, you'll
see how I debunked this whole "Quicksilver" oil myth by explaining
through the sales department's hyperbole.

According to Mercury, they mix a SAE 25 and SAE 40 oil and call it a
25W40 oil. There is ABSOLUTELY NOTHING concerning the formulation or
rating of oils that makes THE LEAST sense in this as relates to a
multi-viscosity oil. The 25W oil rating has nearly nothing to do with
viscosity.

Take two base stocks, say, SAE 25 and SAE 40, mix them together and
you have some single weight oil with a viscosity of something between
SAE 25 and SAE 40. You do NOT have a 25W40 oil.

The only significant bit of information in the article is that single
weight oils are not subject to the failure of viscosity improvers and,
thus, may offer more protection than synthetic oils.


Accurate technical knowledge about any aspect of boating was never the
real Skippy's forte.

"Shortwave Sportfishing" wrote in message
news
On Thu, 13 Oct 2005 01:15:17 GMT, Gene Kearns
wrote:

So true. If you google up the prior posting of this nonsense, you'll
see how I debunked this whole "Quicksilver" oil myth by explaining
through the sales department's hyperbole.

I thought it was pretty funny trying to sell a Newtonian fluid as
opposed to a non-Newtonian fluid.

Sometimes, you just gotta wonder.

I was wondering why they added apple juice to the mix.

Harry Krause wrote:

Yep.... and if it was the *real* Skipper we would have already been
forced to endure, yet another, seasonal, long winded pseudo-technical
diatribe on the *only* way to winterize.....

Ah, yes, with the "kit" or whatever the hell he used.

I have an easier method:

1. Drive boat to dealership.

2. Tell servicewriter to winterize boat and motor,
wash and wax boat, and shrinkwrap entire package.
Batteries are removed and stored indoors.

3. Store rig at back of dealer's huge fenced lot.

4. Mail the bill to me.

Deal performs service competently, changes oil and filter, checks for
any warranty items, takes care of, et cetera.

In the spring, about two weeks before I want the boat, I call the dealer
and say:

"Recommission."

And what does that cost for your fabulous 36' Zimmermanlike lobstaboat,
exactly?
--
Skipper

Skipper wrote:

And what does that cost for your fabulous 36' Zimmermanlike lobstaboat,
exactly?

Oh yes, do they charge extra for servicing that get home engine?

--
Skipper

Thanks for the info, Guys.

Jerry


"JP" wrote in message news:k%g3f.4864$bt2.2544@okepread05...
Hello All,
I have 2001 4.3 Liter Mrecruiser I/O. I know all the Merc manuals all
say use only the Merc brand oil, but I want to know if using Mobil 1
synthetic will be better for the engine (since it is in a Blazer or
S-10!!)
I know Merc wants to sell oil, but are there any cons to using synthetic
instead of the Merc dinosaur juice? Thank you in advance.

Jerry

"Skipper" wrote in message
...
And what does that cost for your fabulous 36' Zimmermanlike lobstaboat,
exactly?
--
Skipper

Don't forget about the Parker fantasy boat. You know the one...65 knots,
sat-com downlink, wrong time GPS...

Wonder if that's the same GPS he uses to set his trim?

LOL!


--
-Netsock

"It's just about going fast...that's all..."
http://home.columbus.rr.com/ckg/