Like Tree9Likes

Best oil for 509 mercruiser supercharged mild build 787 hp?

Reply
Old 05-17-2017, 10:32 PM
  #1
Registered
Thread Starter
 
Join Date: Apr 2017
Posts: 32
Default Best oil for 509 mercruiser supercharged mild build 787 hp?

Bought boat with previous owner saying he used royal purple 10w 40....original owner said he used 20w 50 valvoline racing oil...we use 25w 40 synthetic blend on all our stock mercruisers at my shop....lost a little oil due to loose dip stick.....wondering if I should just top off with royal purple or just change the whole thing....
Checkmate787hp is offline  
Reply With Quote
Old 05-18-2017, 09:43 AM
  #2
Platinum Member
Platinum Member
Trade Score: (7)
 
getrdunn's Avatar
 
Join Date: Feb 2009
Location: NW Michigan
My Boats: 12 meter
Posts: 4,737
Default

Depends on how big of a rush your in. Limited time top it with purple royal but when time permits id change over to the 20/50 valvoline. Lots of good old oil threads as well as filters. Someone posted all the different brand filters some time back showing them cut down through the center. Pretty amazing info. You'll find wix being right up near the top.
getrdunn is online now  
Reply With Quote
Old 05-18-2017, 11:30 AM
  #3
Registered
Thread Starter
 
Join Date: Apr 2017
Posts: 32
Default

It has the k&n oil filter....I'm more trying to figure out to stay with a 10w 40 or go to a 20w 50
Checkmate787hp is offline  
Reply With Quote
Old 05-18-2017, 11:35 AM
  #4
Registered
Thread Starter
 
Join Date: Apr 2017
Posts: 32
Default

I mean I'm not racing this boat or beating the snot out of it....it's more of cruising on my lake with the occasional wide open run..... and a few times this summer to big water and ocean...
Checkmate787hp is offline  
Reply With Quote
Old 05-18-2017, 11:45 AM
  #5
Platinum Member
Platinum Member
Trade Score: (5)
 
F-2 Speedy's Avatar
 
Join Date: May 2012
Location: Midwest & T-Rock
My Boats: F-2 Speed Racer
Posts: 4,151
Default

Id get rid of the kn filter and the purple juice, jmo
F-2 Speedy is online now  
Reply With Quote
Old 05-18-2017, 12:12 PM
  #6
Registered
Thread Starter
 
Join Date: Apr 2017
Posts: 32
Default

Quote:
Originally Posted by F-2 Speedy View Post
Id get rid of the kn filter and the purple juice, jmo
Any reason for that and what should I go to? The oil was just done too so I'll prob switch mid summer
Checkmate787hp is offline  
Reply With Quote
Old 05-18-2017, 01:09 PM
  #7
Platinum Member
Platinum Member
Trade Score: (5)
 
F-2 Speedy's Avatar
 
Join Date: May 2012
Location: Midwest & T-Rock
My Boats: F-2 Speed Racer
Posts: 4,151
Default

I like the 20/50 VR1 you mentioned but dont know what kind of water you run in ( meaning temps ) wix anti drain back 51060R is a good filter choice, but its all preference,
F-2 Speedy is online now  
Reply With Quote
Old 05-18-2017, 01:40 PM
  #8
Platinum Member
Platinum Member
Trade Score: (2)
 
Join Date: Jul 2012
Location: indianapolis
My Boats: 42 fountain
Posts: 1,073
Default

I always have ran brad Penn 20-50 in all my supercharged marine engines.
indysupra is offline  
Reply With Quote
Old 05-18-2017, 03:50 PM
  #9
Registered
 
Join Date: Oct 2012
Location: Buffalo NY
My Boats: 86 Formula 242 SR1 79 Formula F18(sold)
Posts: 872
Default

Same here.
Quote:
Originally Posted by indysupra View Post
I always have ran brad Penn 20-50 in all my supercharged marine engines.
79formula is offline  
Reply With Quote
Old 05-18-2017, 05:28 PM
  #10
Registered
 
Join Date: Oct 2012
My Boats: 280 Velocity
Posts: 817
Default

Quote:
Originally Posted by Checkmate787hp View Post
Any reason for that and what should I go to? The oil was just done too so I'll prob switch mid summer
There are a lot of opinions on oil and filters. I Personally like the k&n and mobile one. That's my opinion.
underpsi68 is offline  
Reply With Quote
Reply



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



All times are GMT -5. The time now is 08:36 AM.


Copyright 2011 OffShoreOnly. All rights reserved.