Engine oil and fuel oil have quite different compositions.

One of the main reasons for changing the engine oil at regular intervals is
to rid the engine of potentially harmfull chemical compounds picked up in
the lubricating oil as a by product of combustion. Changing the oil removes
them completely and I for one would not introduce them back into the engine
via the fuel, in any concentration particularly in a marine engine where
reliability and longevity is a key issue.

If it is an environmental issue you are thinking about I would rather fill
my containers with contaminated engine oil and take them to the local tip
site for collection than to burn it in my engine, as at any concentration
the combustion in the engine will still have to burn all your sump oil which
contributes to greenhouse emmissions and any compounds that wont burn will
blow out the exhaust and drop into the water.

I believe burning the cleanest fuel the most efficient way is the best way
to go.

In that regard my efforts and money would best be spent be on keeping the
engine serviced in peak running order, paying particular attention to
compression and injectors and rail pressures leaks etc.

Cam

"Skip Gundlach" wrote in message
oups.com...
This may have been covered in some distant past threads, but if so, I
don't recall the outcome of what most likely was conjecture rather than
petroleum engineering observation, in any event.

Thus...

My Perkins 4-154 has a sump drain which connects to a hose with a
seacock inline. To do oil changes, one opens the seacock, connects a
pump to the higher-than-the-engine end of the hose and evacuates the
old oil, changes the filter and puts in new oil.

My fuel polishing setup is now complete, and is such overkill in volume
(3.5 gpm, run for 24 hours, would recycle my entire tank more than 50
times, at a cost of about 19AH) that I'm comfortable with its ability
to clean my tank, regardless of what may come up the common supply tube
(engine feeds from the same line). I've also now got a dual Racor
setup to be able to change filters with the engine running - both the
polishing system and the Racors have vacuum gauges to monitor
appropriate change intervals - but that's not the point of my post.
That big pump, recycling to that big tank, is...


Is there any scientific reason which would encourage, or discourage,
utilizing a pump to do engine oil change waste oil evacuations, putting
the waste oil into the diesel tank (circa 100 gallons; i.e. ~1-2%
typical), for mixing and burning with the rest, thus neatly not only
solving the disposal problem but also reclaiming the dead dinos'
energy?

If there are engineering reasons against, due to the nature of the
waste oil, are there any levels of change (more frequent) which would
mitigate those, assuming that filter changes occurred at the same
intervals?

I know it's useless to ask :{)) but it would be more informative to
have sound engineering rather than conjecture in reply to this topic...

L8R

Skip, back to shoring up ancient flooring supports

Morgan 461 #2
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