Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 23-04-2012, 14:12   #1
Registered User
 
Aussie_Sequoia's Avatar

Join Date: Apr 2011
Location: New South Wales, Australia
Boat: Prout Event 34
Posts: 250
Send a message via Skype™ to Aussie_Sequoia
Oil weight for 3GM-30 in Baja

Hi all,

Changing the oil in my Yanmar 3GM 30HP. I believe that there was SAE 40 in there before, but I have a spare 5 liters of SAE 50 on board.

We're cruising the Sea of Cortez... any idea if this is suitable for that engine coming up to Summer time and lots of hot days?

Cheers!
__________________

__________________
Aussie_Sequoia is offline   Reply With Quote
Old 23-04-2012, 14:53   #2
Guest

Join Date: Nov 2010
Posts: 433
Re: Oil weight for 3GM-30 in Baja

Yanmar recommends 30w for the 3gm30. 30w, 40w, and 50w all are very close in viscosity at operating temperature after the engine is warmed. They are not close in viscosity at cold temperatures such as 70-80F. The only problem with using the 50w oil will be not getting quite enough lubrication during the warm-up period for the engine. After warm-up, the lubrication should be OK. I assume you are talking about 50w and not 10w-50, which is quite different. Considering the price of oil versus the price of engine rebuilds, if it were my engine, I would buy some 30w and perhaps use the 50w for topping up the motor oil when needed.
__________________

__________________
Noname is offline   Reply With Quote
Old 24-04-2012, 12:57   #3
Registered User
 
Aussie_Sequoia's Avatar

Join Date: Apr 2011
Location: New South Wales, Australia
Boat: Prout Event 34
Posts: 250
Send a message via Skype™ to Aussie_Sequoia
Re: Oil weight for 3GM-30 in Baja

It will be over 100F during the next many months here... and I'll change the oil before it cools off anyway. Cheers for the info though
__________________
Aussie_Sequoia is offline   Reply With Quote
Old 24-04-2012, 13:08   #4
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,750
Re: Oil weight for 3GM-30 in Baja

Quote:
Originally Posted by Aussie_Sequoia View Post
It will be over 100F during the next many months here... and I'll change the oil before it cools off anyway. Cheers for the info though
Yeah, but what is the water temperature? Marine diesels are typically very well cooled, and will maintain the same operating temp regardless of the ambient temperature. I would never deviate that far from the manufacturer's standard, personally, or in fact, at all. 50w (which I've never seen in my life; maybe you're talking about 20-50w?) would be practically like gear oil. I don't think it could be good.

Beware that semi-synthetic oil or oil of a higher grade than recommended can damage a marine engine. If I were you, I would stick to exactly what Yanmar recommends. Here's a good article: Oil for yacht engines
__________________
Dockhead is offline   Reply With Quote
Old 24-04-2012, 15:09   #5
Guest

Join Date: Nov 2010
Posts: 433
Re: Oil weight for 3GM-30 in Baja

Hope all goes well with the sae50w. Good cruisin' to ya.
__________________
Noname is offline   Reply With Quote
Reply

Tags
3gm, baja, oil

Thread Tools
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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:34.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.