On Wed, 06 Oct 2004 05:40:04 GMT, WaIIy
wrote:


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?

Karen has pretty much hit it. Straight 40 weight if that's what the
manufacturer recommends.

However, you might want to discuss with him the age of the motor and
if it's lasted this long on the 30/40 combination, then why not stick
with it?

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

Short Wave Sportfishing wrote:




Karen has pretty much hit it. Straight 40 weight if that's what the
manufacturer recommends.


Tom

Multigrade oils do not "thicken up" when they get hot, hotter, or really
hot.

Rob

On Wed, 06 Oct 2004 10:04:00 -0400, trainfan1
wrote:

Short Wave Sportfishing wrote:




Karen has pretty much hit it. Straight 40 weight if that's what the
manufacturer recommends.


Tom

Multigrade oils do not "thicken up" when they get hot, hotter, or really
hot.

I understand that. I agreed with Karen on her statement about the
manufacturer's recommendations.

I thought that was pretty evident.

Take care.

Tom

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

trainfan1 wrote:
Short Wave Sportfishing wrote:




Karen has pretty much hit it. Straight 40 weight if that's what the
manufacturer recommends.



Tom


Multigrade oils do not "thicken up" when they get hot, hotter, or really
hot.

Rob

I agree Rob it was a bad turn of phrase & I apologise.... again:-)

The main thing is that in multi grade oils the actual oil (before
additives etc) is the lower of the grades, so it will (deliberately)
stay thinner at lower temps.

As for the rest..... hmmm the way the price of oil is going it won't
matter much soon.

Thanks for the whack behind the ear; I deserved it:-)

I just got overly excited about an on topic post:-)

K

On Fri, 08 Oct 2004 18:10:53 +1000, "K. Smith"
wrote:

trainfan1 wrote:
Short Wave Sportfishing wrote:




Karen has pretty much hit it. Straight 40 weight if that's what the
manufacturer recommends.



Tom


Multigrade oils do not "thicken up" when they get hot, hotter, or really
hot.

Rob

I agree Rob it was a bad turn of phrase & I apologise.... again:-)

The main thing is that in multi grade oils the actual oil (before
additives etc) is the lower of the grades, so it will (deliberately)
stay thinner at lower temps.

As for the rest..... hmmm the way the price of oil is going it won't
matter much soon.

Thanks for the whack behind the ear; I deserved it:-)

I just got overly excited about an on topic post:-)

I feel your pain. :)

Take care.

Tom

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