Just had a new MERC factory rebuilt engine put in 2 months ago and now it's
time to change the oil in it. Marina that put engine in put in straight 30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe

On 15 Jun 2004 18:37:24 GMT, (Jodon2) wrote:
Just had a new MERC factory rebuilt engine put in 2 months ago and now it's
time to change the oil in it. Marina that put engine in put in straight 30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe

=================================

Yes unless you run in really hot weather, in which case you might
consider straight 40 weight. Most people regard multi-weight oil as
undesirable in boat engines because of the risk that it will suffer
from viscosity loss in severe service.

Yes, use straight 30 weight oil.

--
Tony
my boats at http://t.thomas.home.mchsi.com

"Jodon2" wrote in message
...
Just had a new MERC factory rebuilt engine put in 2 months ago and now
it's
time to change the oil in it. Marina that put engine in put in straight 30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe

The Merc recommendation is 40.


"Tony Thomas" wrote in message
news:YaLzc.97409$3x.4323@attbi_s54...
Yes, use straight 30 weight oil.

--
Tony
my boats at http://t.thomas.home.mchsi.com

"Jodon2" wrote in message
...
Just had a new MERC factory rebuilt engine put in 2 months ago and now
it's
time to change the oil in it. Marina that put engine in put in straight
30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe

also was told to use the 4 stroke oil from merc?

I think the Merc oil is 25w40 and really isn't much more than the price of
regular oil. I would go with what the marina said unless you do a lot of
hard running or live where it's HOT! The use 40

"Jodon2" wrote in message
...
Just had a new MERC factory rebuilt engine put in 2 months ago and now
it's
time to change the oil in it. Marina that put engine in put in straight 30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe

I might have missed some messages in this thread, but has anyone suggested
reading the owner's manual?

====

Charles T. Low
- remove "UN"
www.boatdocking.com/BDPhoto.html - Photo Contest
www.boatdocking.com
www.ctlow.ca/Trojan26 - my boat

====

"Woodchuck" wrote in message
...
I think the Merc oil is 25w40 and really isn't much more than the price of
regular oil. I would go with what the marina said unless you do a lot of
hard running or live where it's HOT! The use 40

"Jodon2" wrote in message
...
Just had a new MERC factory rebuilt engine put in 2 months ago and now
it's
time to change the oil in it. Marina that put engine in put in straight
30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe

no one reads the manual anymore for anything... just in too much of a hurry.
I work at a new car dealer and you would be surprised how many owners bring
their cars in for problems. All they need to do is read the manual to find
how it works.

"Charles T. Low" wrote in message
...
I might have missed some messages in this thread, but has anyone suggested
reading the owner's manual?

====

Charles T. Low
- remove "UN"
www.boatdocking.com/BDPhoto.html - Photo Contest
www.boatdocking.com
www.ctlow.ca/Trojan26 - my boat

====

"Woodchuck" wrote in message
...
I think the Merc oil is 25w40 and really isn't much more than the price
of
regular oil. I would go with what the marina said unless you do a lot of
hard running or live where it's HOT! The use 40

"Jodon2" wrote in message
...
Just had a new MERC factory rebuilt engine put in 2 months ago and now
it's
time to change the oil in it. Marina that put engine in put in
straight
30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe

"Charles T. Low" wrote in message ...
I might have missed some messages in this thread, but has anyone suggested
reading the owner's manual?

====

Charles T. Low
- remove "UN"
www.boatdocking.com/BDPhoto.html - Photo Contest
www.boatdocking.com
www.ctlow.ca/Trojan26 - my boat

====

"Woodchuck" wrote in message
...
I think the Merc oil is 25w40 and really isn't much more than the price of
regular oil. I would go with what the marina said unless you do a lot of
hard running or live where it's HOT! The use 40

"Jodon2" wrote in message
...
Just had a new MERC factory rebuilt engine put in 2 months ago and now
it's
time to change the oil in it. Marina that put engine in put in straight
30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe


More than you wanted to know about motor oil:
http://www.fourfold.org/RoverWeb/OilFAQ.html

If you don't have the patience to read then the Merc oil 25w40 is one of the better oils for your boat.

Multi viscosity oils are one of the great improvements in oils, but they should be chosen wisely. Always use a multi grade with the narrowest span of viscosity that is appropriate for the temperatures you are going to encounter. In the winter base your decision on the lowest temperature you will encounter, in the summer, the highest temperature you expect. The polymers can shear and burn forming deposits that can cause ring sticking and other problems. 10W-40 and 5W-30 require a lot of polymers (synthetics excluded) to achieve that range. This has caused problems in diesel engines, but fewer polymers are better for all engines. The wide viscosity range oils, in general, are more prone to viscosity and thermal breakdown due to the high polymer content. It is the oil that lubricates, not the additives. Oils that can do their job with the fewest additives are the best.


Very few manufactures recommend 10W-40 any more, and some threaten to void warranties if it is used. It was not included in this article for that reason. 20W-50 is the same 30 point spread, but because it starts with a heavier base it requires less viscosity index improvers (polymers) to do the job. AMSOIL can formulate their 10W-30 and 15W-40 with no viscosity index improvers but uses some in the 10W-40 and 5W-30. Mobil 1 uses no viscosity improvers in their 5W-30, and I assume the new 10W-30. Follow your manufacturer's recommendations as to which weights are appropriate for your vehicle.