I just got one posting from this tread so my questions may have already been
answered.
I have hear of this practice being done.
What grade and viscosity of oil are you using? Is the oil filter replaced
every season or after x number of running hours?

"Dave" wrote in message
...
On Tue, 14 Jun 2005 19:08:22 -0400, Jeff said:

Let me get this straight. You put in that nice clean oil in the fall,
and
then drain that nice clean oil and replace it in the spring? What am I
missing here?

I guess you're missing out on proper maintenance of a diesel engine.

So what's your point? That I'm wasting $4 on two extra quarts of oil
a year? Are you claiming my engines are "too clean"? I'll admit that
this is a "belt and braces" approach, but I'd rather err on the being
more conservative when it comes to oil changes. Diesels push a lot of
carbon into the oil, and this is reduces the efficiency of the oil,
not breakdown. So it seems to me it hard to have an engine that's too
clean.

The point should be obvious with a moment of thought. Just how much carbon
does that diesel create while sitting idle over the winter filled with
clean
oil? Your theory is that filling the engine with clean oil in the fall,
draining that clean oil in the spring and refilling with clean oil is
giving
the engine an oil bath? And that this annual oil bath is essential to
proper
maintenance of a diesel engine? A novel theory. Do you do the same thing
with your car? Change the oil, and then immediately change the oil again
so
as to give the engine a bath?

Silly argument. Oil is cheap. Engines are not. To err on the side of excess
does no harm and may do some good.

Besides, when you change the oil in spring that you put in in the fall you
must first run the enine and bring it up to operating temperature to reduce
the viscosity of the oil so you can get it out. This serves several purposes.
The engine doesn't just sit there over the winter. It aspirates and water
condenses inside it. Because you have clean oil in there that water does not
form bearing-eating acid. The additives in the clean oil neutralize the acids.
Then running the engine with the fall oil flushes all operating parts. The
spring oil works fine over the summer because the engine is often at operating
temperature and condensation is little problem.

And yes, I have indeed chnaged the oil and then immnediatley chnaged it again.
Can't quite remember why but it certainly did no harm at small expense.

As for my car, it's a diesel too. It works very, very hard and I let my
mechanic look after it.

To repeat: Oil is cheap. Engines are not.

As for grade, Castrol Heavy Duty SAE 30. No multi-viscosity. That's for the
car. Why? Car engine runs from 800 RPM to 4,000 RPM and back over and over.
Boat engine, except when idling, runs a constant 2,100 RPM.

After having the engine rebuild, I was told to only use IDO (Industrial
Diesel Oil) SAE 30 or its exact equilvalent.
Esso also makes a SAE 30 lubricating oil for diesel engine. I sure that
you can get other brands it just that these are the only one I get locally.
I my area I can only get Castrol 10w40 for diesel engine. The other
question is when to you change your oil filter.
In the spring or the fall ( before launching or before haul out org ) ?
Oil filter are not that expensive. In my case I was able to get Fram's
exact equilvalent filter for my Yanmar.
"Gogarty" wrote in message
...
Silly argument. Oil is cheap. Engines are not. To err on the side of
excess
does no harm and may do some good.

Besides, when you change the oil in spring that you put in in the fall you
must first run the enine and bring it up to operating temperature to
reduce
the viscosity of the oil so you can get it out. This serves several
purposes.
The engine doesn't just sit there over the winter. It aspirates and water
condenses inside it. Because you have clean oil in there that water does
not
form bearing-eating acid. The additives in the clean oil neutralize the
acids.
Then running the engine with the fall oil flushes all operating parts. The
spring oil works fine over the summer because the engine is often at
operating
temperature and condensation is little problem.

And yes, I have indeed chnaged the oil and then immnediatley chnaged it
again.
Can't quite remember why but it certainly did no harm at small expense.

As for my car, it's a diesel too. It works very, very hard and I let my
mechanic look after it.

To repeat: Oil is cheap. Engines are not.

As for grade, Castrol Heavy Duty SAE 30. No multi-viscosity. That's for
the
car. Why? Car engine runs from 800 RPM to 4,000 RPM and back over and
over.
Boat engine, except when idling, runs a constant 2,100 RPM.

In article ,
says...


After having the engine rebuild, I was told to only use IDO (Industrial
Diesel Oil) SAE 30 or its exact equilvalent.
Esso also makes a SAE 30 lubricating oil for diesel engine. I sure that
you can get other brands it just that these are the only one I get locally.
I my area I can only get Castrol 10w40 for diesel engine. The other
question is when to you change your oil filter.
In the spring or the fall ( before launching or before haul out org ) ?
Oil filter are not that expensive. In my case I was able to get Fram's
exact equilvalent filter for my Yanmar.

I change the filter when I change the oil, which is probably twice as often as
is really necessary since the filter installed after the oil change in the
fall doesn't really get any use until the following season.