From Page 8 of the OMC manual for the 15HP, a 1992j model:

To protect your new outboard motor during the intiial hours of operation,
and to seat internal engine components, you MUST (emphasis theirs) add extra
oil during the break-in period.

The fuel/oil ratio for the first 12 gallons must be *25-1* (emphasis
theirs).

The fuel oil ratio during normal operation, after break-in, must be *50-1*
(emphasis theirs).


My 6HP manual in hand is just before they went to 100-1 oil. Note that
this, a 2005 manual, as the dealer didn't have a current one, is for the
normally 50-1 mix engine. My 6 is actually a couple of years later, and the
recommended use is for half of that shown above. As mine was a trade-in, it
didn't happen to have its original manual, explaining why I'm looking at an
older one.

It says, on page 15:

The fuel/oil ratio for the first 10 hours must be *25-1* (emphasis theirs).

The fuel oil ratio during normal operation, after break-in, must be *50-1*
(emphasis theirs).

HOWEVER...

"During high performance opertion you must use a *25-1* fuel/oil ratio in
your fuel tank."

Now, I agree, OMC is a poor source of information about what to use in their
engines for them to warranty them.

But until some more authoratative source presents, I'm going with the
manual.l NOTHING in it suggests, and, quite the contrary, demands its use,
for high performance, that doubling the oil is harmful to the engine.

Indeed, high performance seems to me to be more stressful, and, as such, if
the assertions that too much oil will melt the aluminum, that the
recommendation would be for LESS oil, not doubling it...

L8R

Skip

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On Mon, 25 Oct 2010 18:48:09 +0200, "Steve Lusardi"
wrote:

Ted,
Adding lube oil to gasoline lowers the flash point of the fuel increasing the chance of detonation. Oil in the fuel is necessary
for these type of engines, but NEVER use more than the manufacturer's recommendation. Failure to follow this simple direction
could melt the pistons, the heads and effectively ruin the engine and I have seen this hundreds of times.

as yet i find it hard to believe that you've seen it happen at
all, much less hundreds of times. how much more oil are you
talking about?

I know this is counter intuitive,

to say the least.

hence the number of times this failure occurs.

can you provide any reason to believe that happens a lot, other
than your own unlikely sounding claim? i've never heard of it
happening at all, and if it were as common as you say it is it
seems it's one of those things mechanics would warn people about.

ted@theted. wrote in message ...
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

On Oct 25, 12:02*pm, ted@theted. wrote:
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I only have smaller 2 strokes and one jetski. The jetski mixes it's
self with a oil pump to the carbs. But I mix the same ratio for all
my small engines without any problems.

Engine repair shops love customers like you....you keep them in business.
Steve

"jamesgangnc" wrote in message ...
On Oct 25, 12:02 pm, ted@theted. wrote:
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I only have smaller 2 strokes and one jetski. The jetski mixes it's
self with a oil pump to the carbs. But I mix the same ratio for all
my small engines without any problems.

On Mon, 25 Oct 2010 11:46:00 -0700 (PDT), jamesgangnc
wrote:

On Oct 25, 12:02*pm, ted@theted. wrote:
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I only have smaller 2 strokes and one jetski. The jetski mixes it's
self with a oil pump to the carbs.

the guy who was working on it suggested that i have the pump mix
system removed for a couple of reasons. one was because it was
smoking badly meaning it was mixing too much oil, and the other
was because somewhere in that system it was leaking oil into the
hull. he said it could just as easily mix too little as mix too
much and that would ruin the engine, so i figured after getting
lucky and having a second chance it was best to have the messy
threat removed so it won't ever be an issue again.

But I mix the same ratio for all
my small engines without any problems.

what ratio?

ted@theted. wrote in message
...
On Mon, 25 Oct 2010 11:46:00 -0700 (PDT), jamesgangnc
wrote:

On Oct 25, 12:02 pm, ted@theted. wrote:
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I only have smaller 2 strokes and one jetski. The jetski mixes it's
self with a oil pump to the carbs.

the guy who was working on it suggested that i have the pump mix
system removed for a couple of reasons. one was because it was
smoking badly meaning it was mixing too much oil, and the other
was because somewhere in that system it was leaking oil into the
hull. he said it could just as easily mix too little as mix too
much and that would ruin the engine, so i figured after getting
lucky and having a second chance it was best to have the messy
threat removed so it won't ever be an issue again.

But I mix the same ratio for all
my small engines without any problems.

what ratio?



Idiot! Moron. Fool. There could well be other oil feed lines than the ones
to the carbs that you see. That might be where the oil leak is coming from.
If this were the case and the oil feed was going to lubricate the crankshaft
main bearings, for example, and there were oil seals in place to separate
the bearings from the crankcase to better facilitate secondary compression
and transfer of the fuel/oil mix, the main bearings, having no source of
lubrication, (the fuel/oil mixture couldn't get to the bearings because of
the seals) would quickly overheat and fail. your mechanic is not to be
trusted. He's stupid, ignorant or both.

Wilbur Hubbard

"Wilbur Hubbard" wrote in message
anews.com...
ted@theted. wrote in message
...
On Mon, 25 Oct 2010 11:46:00 -0700 (PDT), jamesgangnc
wrote:

On Oct 25, 12:02 pm, ted@theted. wrote:
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I only have smaller 2 strokes and one jetski. The jetski mixes it's
self with a oil pump to the carbs.

the guy who was working on it suggested that i have the pump mix
system removed for a couple of reasons. one was because it was
smoking badly meaning it was mixing too much oil, and the other
was because somewhere in that system it was leaking oil into the
hull. he said it could just as easily mix too little as mix too
much and that would ruin the engine, so i figured after getting
lucky and having a second chance it was best to have the messy
threat removed so it won't ever be an issue again.

But I mix the same ratio for all
my small engines without any problems.

what ratio?



Idiot! Moron. Fool. There could well be other oil feed lines than the ones
to the carbs that you see. That might be where the oil leak is coming
from. If this were the case and the oil feed was going to lubricate the
crankshaft main bearings, for example, and there were oil seals in place
to separate the bearings from the crankcase to better facilitate secondary
compression and transfer of the fuel/oil mix, the main bearings, having no
source of lubrication, (the fuel/oil mixture couldn't get to the bearings
because of the seals) would quickly overheat and fail. your mechanic is
not to be trusted. He's stupid, ignorant or both.

Wilbur Hubbard
Sounds like Wilber is off his meds again. Just let him ramble.

ted@theted. wrote in message
...
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I follow the manual recommendations.
i also dropped into the Vespa scooter store and bought the little plastic
measuring device.
It's great for a 50:1 mix. Saves guess work when out on the high seas.

"YukonBound" wrote in message
...


ted@theted. wrote in message
...
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I follow the manual recommendations.
i also dropped into the Vespa scooter store and bought the little plastic
measuring device.
It's great for a 50:1 mix. Saves guess work when out on the high seas.
You take a Vespa out on the high seas Don?

"MMC" wrote in message
g.com...


"YukonBound" wrote in message
...


ted@theted. wrote in message
...
i have a jetski and a boat with an evinrude 115 hp outboard. can
they both use the same gas/oil mix? someone told me it should be
a pint to six gallons but i would rather mix a pint with 5
gallons because it's easier and to be on the safe side if that's
ok. is a pint to 5 gallons ok for both the jetski and the
evinrude?

thanks!

ted

I follow the manual recommendations.
i also dropped into the Vespa scooter store and bought the little plastic
measuring device.
It's great for a 50:1 mix. Saves guess work when out on the high seas.
You take a Vespa out on the high seas Don?

Why not... strap a couple of pontoons on the side and engage the marine
drive..............................