Offshoreonly.com

Go Back  Offshoreonly.com > Technical > General Q & A
any gain in RPM with lighter weight oil? >

any gain in RPM with lighter weight oil?

Register
FAQ
Calendar
Today's Posts
Search
Vendor Directory
Notices

any gain in RPM with lighter weight oil?

Thread Tools
 
Old 08-28-2009 | 10:17 PM
  #1  
Ultraboy
Thread Starter
Registered
15 Year Member
 
Joined: Jun 2007
Posts: 107
Likes: 9
Default any gain in RPM with lighter weight oil?
would there be any gain in WOT engine RPM when switching from straight 40 weight oil to 25W40 weight Mercruiser oil?
Last edited by Ultraboy; 08-28-2009 at 10:25 PM.
Ultraboy is offline  
Reply
0
Old 08-28-2009 | 10:29 PM
  #2  
Griff's Avatar
Griff
Charter Member # 55
25 Year Member
Charter Member
Super Moderators
 
Joined: Oct 2000
Posts: 20,232
Likes: 2,482
From: Omaha/LOTO
Default
No
Griff is offline  
Reply
0
Old 08-29-2009 | 09:04 AM
  #3  
07DominatorSS
Registered
 
Joined: Feb 2008
Posts: 715
Likes: 0
From: Michigan
Default
Originally Posted by Ultraboy
would there be any gain in WOT engine RPM when switching from straight 40 weight oil to 25W40 weight Mercruiser oil?
A 40 weight is a 40 weight is a 40 weight. A straight 40 is just as heavy as a 25w-40.
07DominatorSS is offline  
Reply
0
Old 08-29-2009 | 05:50 PM
  #4  
CB-BLR's Avatar
CB-BLR
Chris
 
Joined: Sep 2005
Posts: 1,426
Likes: 1
From: Snohomish, WA
Default
Do you think you would gain any RPM switching from 20/50 to 15/40?

Chris
CB-BLR is offline  
Reply
0
Old 08-29-2009 | 10:00 PM
  #5  
Griff's Avatar
Griff
Charter Member # 55
25 Year Member
Charter Member
Super Moderators
 
Joined: Oct 2000
Posts: 20,232
Likes: 2,482
From: Omaha/LOTO
Default
Originally Posted by CB-BLR
Do you think you would gain any RPM switching from 20/50 to 15/40?

Chris
No.
Griff is offline  
Reply
0
Old 08-31-2009 | 06:03 AM
  #6  
minxguy
Registered
 
Joined: Oct 2005
Posts: 756
Likes: 1
From: New Hartford CT
Default
Originally Posted by 07DominatorSS
A 40 weight is a 40 weight is a 40 weight. A straight 40 is just as heavy as a 25w-40.

...at 210 F.........................at temps over 210 a 25w40 thins less and at temps below 210 an SAE 40 is more viscous.

Ken
minxguy is offline  
Reply
0
Back to Subforum
General Q & A
View Next Unread
MEFI 1 to MEFI 4 on 350 TBI

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 On
Pingbacks are On
Refbacks are On



Advanced Search

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.