Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 11-08-2022, 06:07   #1
Registered User

Join Date: Jun 2010
Location: florida
Boat: 42' vagabond
Posts: 85
changing the diesel oil

Hi, for the last two years , we and our 42' vagabond sailboat have not gone very far. Just around the bay. Did not put many hours on the diesel engine. no engine hour meter . Question is , would you just not change the oil or because of the time, change it anyway?
chuckg5 is offline   Reply With Quote
Old 11-08-2022, 06:32   #2
Registered User
 
pcmm's Avatar

Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 1,868
Images: 2
Re: changing the diesel oil

Quote:
Originally Posted by chuckg5 View Post
Hi, for the last two years , we and our 42' vagabond sailboat have not gone very far. Just around the bay. Did not put many hours on the diesel engine. no engine hour meter . Question is , would you just not change the oil or because of the time, change it anyway?
For the cost of the Oil change materials I do not see the benefit in NOT doing it. I do an Oil change every fall before winter storage. My greatest concern with not doing the regular change is just forgetting about it. Suddenly not doing it one season turns into 4 season old oil with all the contaminants built up, etc.

I would stick to regular oil changes as a matter of good maintenance.
pcmm is offline   Reply With Quote
Old 11-08-2022, 07:20   #3
running down a dream
 
gonesail's Avatar

Join Date: Mar 2006
Location: FLORIDA
Boat: cape dory 30 MKII
Posts: 2,744
Images: 6
Send a message via Yahoo to gonesail
Re: changing the diesel oil

with vehicles it is once a year no matter how many miles. seems like it would be the same for a boat engine. up to you.
__________________
some of the best times of my life were spent on a boat. it just took a long time to realize it

gonesail is offline   Reply With Quote
Old 11-08-2022, 07:46   #4
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jun 2018
Location: Rock Hall, MD
Boat: Mariner 39
Posts: 473
Re: changing the diesel oil

Peter Compton, Troubleshooting Marine Diesels, says to follow the instructions in the service manual, but if you don't have one, then change the oil and filter every 125 hours or seasonally, whichever comes first.

Nigel Calder, Boatowner's Mechanical and Electrical Manual, says basically the same thing about the change interval, and explains how neglecting the oil changes leads to a buildup of acids that will damage surfaces and carbon that will form a sludge that interferes with good oil flow. "A major mechanical breakdown is underway, and all for the sake of a gallon or so of oil, a filter, and less than an hour's work."
JoeRobertJr is offline   Reply With Quote
Old 11-08-2022, 08:00   #5
Registered User
 
Jammer's Avatar

Join Date: Jan 2010
Location: Minnesota
Boat: Tartan 3800
Posts: 3,057
Re: changing the diesel oil

A question where everyone seems to have an opinion.
__________________
There are no stupid questions but there are quite a few stupid answers, especially on CF electrical threads.
Jammer is offline   Reply With Quote
Old 12-08-2022, 04:49   #6
Registered User

Join Date: Jun 2010
Location: florida
Boat: 42' vagabond
Posts: 85
Re: changing the diesel oil

thank for the feed back. I agree in changing the oil. not using the boat on the ocean as it was built for is bothersome and wears on this 73 year old 'past' sailor
chuckg5 is offline   Reply With Quote
Old 12-08-2022, 05:20   #7
Registered User
 
ranger58sb's Avatar

Join Date: Aug 2012
Location: Maryland, USA
Boat: 58' Sedan Bridge
Posts: 5,021
Re: changing the diesel oil

Quote:
Originally Posted by chuckg5 View Post
Hi, for the last two years , we and our 42' vagabond sailboat have not gone very far. Just around the bay. Did not put many hours on the diesel engine. no engine hour meter . Question is , would you just not change the oil or because of the time, change it anyway?

There's a middle-ground approach, with a couple potential variations...

You can have engine and gear oil tested, and one of the tests can speak to remaining longevity. Blackstone Lab, for example, can do that, and their website describes details. Not expensive.

OTOH, with only a small amount of oil involved, it's probably just as cost-effective (perhaps even slightly more so) to change the oil/filter and declare victory.

In our case, 18-gallons of expensive synthetic lube -- and very useful particulate read-out, for engine diagnosis -- makes testing very cost-effective. For maybe a couple gallons or less of standard motor oil... probably not so much, for the simple question about lube viability. (Assumes old oil is recycled responsibly.)

The particulate read-out can still be a very useful diagnostic tool, though, very useful for monitoring engine wear and overall health.

-Chris
__________________
Chesapeake Bay, USA.
ranger58sb is offline   Reply With Quote
Old 12-08-2022, 05:30   #8
Registered User

Join Date: May 2015
Location: Muskegon, Mi
Boat: Columbia 36
Posts: 665
Re: changing the diesel oil

That engine holds what, 2 gallons of oil? So $50 in oil and maybe $10 for the filter why not just do it. Now on the tour boat I ran with it's big twin DD's that hold 10 gallons each it's a little more involved. When you figure in the engineers labor it's a couple thousand. But we still do it every Fall before layup and usually we get enough hours to do one mid season.
capt jgw is offline   Reply With Quote
Old 12-08-2022, 05:35   #9
Registered User

Join Date: Jun 2009
Location: Annapolis, MD
Boat: Sabre 34-1 (sold) and Saga 43
Posts: 1,038
Re: changing the diesel oil

My first thought is that an engine hour meter is super cheap and very useful. My last boat had one that was non-functional. A replacement was less than $20 on ebay. You need to know what those numbers are!

But my second thought. I generally agree with the comments of the posters that said words along the lines of annually, or 125 hours. I wouldn't be afraid to push that 125 to 150 or 175 (it would be frustrating to change the oil in September with 125 hours, and then put only 10 more hours on before the end of the season). My Yanmar manual says 150. But where I would diverge with popular opinion would be what you mean by very little use. If you get 50 or 75 hours a season, change it every fall. But if by very little, you mean 5 to 10 hours a season, I would be really tempted to go to every other year. The problem with the philosophy of "it's not that hard" is that if there's no return on the investment, it's just not worth it. At the point of ridiculous, if you run the engine twice a year, once out of the travel lift and once to the travel lift, changing it after that would be laughable.
sailingharry is offline   Reply With Quote
Old 12-08-2022, 05:44   #10
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,589
Re: changing the diesel oil

You should change you oil before storage to assure there are no acids eating away at things.
The diesel multigrades are really wonderful.
Rumrace is online now   Reply With Quote
Old 12-08-2022, 05:54   #11
Registered User
 
phorvati's Avatar

Join Date: Jan 2006
Location: Rhode Island
Boat: Tayana FD-12
Posts: 1,094
Images: 6
Re: changing the diesel oil

One thing about oil changes. ..if its hard to do, it gets procrasinated. Once I made mine easy to do, I tend to keep up with it every 50-100hours, and before prolonged storage periods.
phorvati is offline   Reply With Quote
Old 12-08-2022, 06:50   #12
Registered User

Join Date: Feb 2011
Location: France, britanny
Boat: twinkeels, 9m
Posts: 273
Re: changing the diesel oil

totally agree,
at least once a year, or 150h (for my Yanmar).
an oil change does not cost anything / the price of the engine or the boat.
hot oil drain of course.
an oil analysis may be advisable after 3 or 4000 hours, or in the event of a slight malfunction (smoke f.e.)


-------------------------------------------------------------------------------
facing a freighter, I'd rather be a living fool than a dead hero...
bil56 is offline   Reply With Quote
Reply

Tags
diesel, oil

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
S rated oil instead of C rated oil for a diesel engine callistov42 Engines and Propulsion Systems 5 10-03-2020 14:26
Changing engine oil adding transmission oil natraps116 Engines and Propulsion Systems 8 27-04-2015 20:24
Stove Oil vs Furnace Oil vs Diesel outdoor Engines and Propulsion Systems 5 04-04-2010 18:00

Advertise Here


All times are GMT -7. The time now is 15:53.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.