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Old 02-26-2016, 07:55 AM   #41
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An interesting question is should the newest best modern lube oil or an old standby be used?

As I understand it CD is most common for old (non DD ) engines and today CK? or such, is what is required for modern big engines.

The difference is in the additive package ,far more detergent is in the new oil.

This is because the Air Police require a cleaner exhaust than what goes in the intake in many locations.

Lowering internal temps (at a great cost in efficiency) is done with EGR, and it is this exhaust fed back into the engine that requires fantastic detergents to control.

Perhaps good old single wt. CD oil would have more OIL in the "oil" and give our antiques their best service life?
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Old 02-26-2016, 08:08 AM   #42
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I am in the "oil probably doesn't matter too much" crowd.

Yes decent oil....yes decent change intervals...

But as someone quoted Tony Athens and loads of other talented engine guys and operators with tons of experience....there are so few engine failures that are directly related to oil and oil changes that it just doesn't strike me as something to bother me.

I test the oil as much for an impending failure by antifreeze, or water getting in or a particular part failing rapidly....IOW...early warning so I can plan a place of repair rather than nowheresville.

So if you think your engine life will be extended to the day after you sell your boat by using better oil or changing it every day...have at it.

I am guessing I will be like everyone else I know with engine issues . They arise from an operational issue or a component that fails and causes enough damage to do a rebuild/replace. Wearing out my engine from cheaper oil or letting it go to recommended intervals and even beyond occasionally isn't a thought that ever enters my mind.

Are there examples? Sure someone can come up with them...but I probably know more people whose boats have been struck by lightning.
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Old 02-26-2016, 10:06 AM   #43
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Are there examples? Sure someone can come up with them...but I probably know more people whose boats have been struck by lightning.
I have skippered a boat when it was struck by lightning. I've never skippered a boat when the engine failed due to old oil.

Just sayin'

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Old 02-26-2016, 10:19 AM   #44
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I'm looking for below "normal wear numbers ".

Ted
If I was running a commercial boat I'd install bypass oil filters and run synthetic oil while doing my first oil analysis at the manufacturers stated oil change interval. Then I'd do subsequent analysis every 100 hours there after. I'd just change the filters at the normal oil change interval.

I've done that on gensets and gone 3 or more times the normal change interval.

I've used the Amsoil bypass filters. https://www.amsoil.com/shop/by-produ...rs-and-mounts/

There is also a system that continually changes your oil as the engine is running and mixes the old oil into your diesel fuel so you just burn it up.

Engineered Machined Products : DNCO Oil Management System
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Old 02-26-2016, 10:21 AM   #45
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Thank you Richard...I can add another to my list....

Fortunately it is only a handful of people and none have been hurt...
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Old 02-26-2016, 10:30 AM   #46
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The main reason we change oil is to get rid of the carbon as a combustion by-product that gets into the oil. The black in oil is the carbon and diesel engines accumulate much more so than gas engines.

The oil gets balck w carbon very quickly in diesels. Many "schedules" have been presented here from just a few hours to hundreds of hours. My take on it is that the wide range of oil changing times represent a wide grey area that makes me think "why get religious about 100hrs, 250hrs" or whatever. Oil dosn't suddenly get black w carbon but in a very idealistic world one should change oil every time the boat was used. And then there's some that never change their oil .. and every scenairo in-between.

I change my oil about twice a year. Usually spring and fall. But I've done it more than that at times. The reasons to change oil vary quite a lot so why stick to some ridgid schedule most likely dictated by someone else and not relavant to your own usage? There's many "experts" w many different change schedules.

I do agree w FF that oil should be changed hot .. right after the boat has been run at cruise speed for a time. And if a good time happend by and it was not on my schedule I may just change it. Dosn't take much time on my boat and dosn't cost very much. An in-between oil change like this dosn't (IMO) require a filter change either making it faster and less expensive yet. And most of the carbon is removed from the oil. A win win .. no downside.
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Old 02-26-2016, 03:20 PM   #47
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We keep talking about engines failing because of the oil used. The issue isn't failure, it's wear over a period of time. For most, the usage is so low, that getting a long term picture and having something else to compare it to is impossible. Let's say engine requires a rebuild at 20,000 hours. We have no way of knowing whether had we used a different oil or changed more frequently would it have gone 22,000 hours or had we gone the other way would it have only gone 18,000 hours. I most definitely am not an expert on oil and don't intend to be. Therefore, I use what the engine manufacturer recommends. I'm willing to concede that they are more expert on their engines than I am.
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Old 02-26-2016, 05:02 PM   #48
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Oil Change Schedule

Show me a boat with 10000 hrs on it and it is worn out and at 20000 hrs you can junk it.
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Old 02-26-2016, 05:44 PM   #49
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Show me a boat with 10000 hrs on it and it is worn out and at 20000 hrs you can junk it.
How do you figure that? A boat with 10,000 hrs on it is less than 2 years old.
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Old 02-26-2016, 05:49 PM   #50
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I'll be 147 by that time.
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Old 02-26-2016, 05:53 PM   #51
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How do you figure that? A boat with 10,000 hrs on it is less than 2 years old.
At 13.7 hours per day.
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Old 02-26-2016, 05:55 PM   #52
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At 13.7 hours per day.
10,000/24 = 416.6 days. :-)
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Old 02-26-2016, 05:56 PM   #53
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10,000/24 = 416.6 days. :-)
I can't argue with that.
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Old 02-26-2016, 06:07 PM   #54
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The original owner of my boat used Sears 30wt.

Since I could not find that switched her to Shell Rotella 30wt. No changes noted.
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Old 02-26-2016, 07:20 PM   #55
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6 knots at 10000 hrs you will have circumnavigated the world twice and for some boats 100 oil change. Wow impressive for 2 years.
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Old 02-26-2016, 09:07 PM   #56
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6 knots at 10000 hrs you will have circumnavigated the world twice and for some boats 100 oil change. Wow impressive for 2 years.
I doubt Bill was thinking 6 knots. He's not a 6 knot kind of guy.
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Old 02-27-2016, 04:25 PM   #57
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Just for the record, here are the articles Tony Athens has posted on his web site regarding this subject. So scratch him of the "loads" of unknown mechanics list

Engine Oil Myths - Seaboard Marine

Cummins Engine Oil and Oil Analysis Recommendations - Seaboard Marine

I often feel this forum is more dangerous than helpful.
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Old 02-27-2016, 05:47 PM   #58
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Just for the record, here are the articles Tony Athens has posted on his web site regarding this subject. So scratch him of the "loads" of unknown mechanics list
Scratch me from one who cares what "loads" of mechanics say and from one who goes to a forum or elsewhere to get an opinion on something that is covered in an engine manual and/or other documents from the manufacturer.

I consider my engine manufacturer to be the expert regarding the engine.

I think the documents you linked to are excellent. The only caveat I would use is that the Service Bulletin is dated 2007 and I would want a more recent one if available and definitely a more recent one for a newer engine.
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Old 02-27-2016, 07:07 PM   #59
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6 knots at 10000 hrs you will have circumnavigated the world twice and for some boats 100 oil change. Wow impressive for 2 years.
You never stated a speed per hour. Only hours on the "boat".
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Old 02-27-2016, 07:10 PM   #60
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I consider my engine manufacturer to be the expert regarding the engine.
As said early on in this thread by many, yes go by your BOOK
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