Like Tree0Likes

What weight of engine oil should I use for a 502 Mag

Reply
Old 04-30-2013, 08:01 PM
  #1
Registered
Thread Starter
 
Join Date: Mar 2013
Location: Toronto Ontario
My Boats: 1996 Baja 272
Posts: 8
Default What weight of engine oil should I use for a 502 Mag

I recently purchased a used 272 Baja with a 502 and I couldn't find a lot of information (didn't get a manual with the boat) on the engine saying what weight of motor oil I should be using. I am boating in Ontario so the air temperature when on the water is in the 70 to 80 degree range. Can anyone offer some guidance on what is a good all round weight of engine oil? I have heard anything from straight 30 weight to 25W40.

Thanks
whosfuelinwho is offline  
Reply With Quote
Old 04-30-2013, 08:43 PM
  #2
Platinum Member
Platinum Member
 
nailit's Avatar
 
Join Date: Oct 2008
Location: Slidell, La.
My Boats: 98' 33 Outlaw, 99' 25 Outlaw
Posts: 1,496
Default

I have always used mercury 25w40. No issues.. but I have the 454 mags.. I have read that 502s usually use a lil oil, so some stp oil treatment could help too.
nailit is offline  
Reply With Quote
Old 05-01-2013, 08:04 AM
  #3
Registered
 
Join Date: Mar 2012
Location: Clearwater, Mn
My Boats: 33 Outlaw
Posts: 1,071
Default

20w-50 Is what I run. The 502 likes thick oil (loose tolerances) . Just let the engine warm up before putting the hammer down. And yes it will burn oil! Keep a qt or 2 with you just incase

I believe Mercury now "recommends" QuickSilver 25w-40 4 stroke oil.. But that has changed with the oil market.
92nsx is offline  
Reply With Quote
Old 05-01-2013, 10:53 AM
  #4
Registered
 
Join Date: Feb 2010
Location: Plano, Texas
My Boats: Baja Boss 272/502
Posts: 604
Default

Quote:
Originally Posted by 92nsx View Post
20w-50 Is what I run. The 502 likes thick oil (loose tolerances) . Just let the engine warm up before putting the hammer down. And yes it will burn oil! Keep a qt or 2 with you just incase

I believe Mercury now "recommends" QuickSilver 25w-40 4 stroke oil.. But that has changed with the oil market.
+1 QS 25/40 her whole life. They do burn some, keep a close eye on it the first few times out to get an idea on usage. They seem to vary a bit. Great motor.
Hook'em is offline  
Reply With Quote
Old 05-01-2013, 11:19 AM
  #5
Registered
 
Join Date: Jun 2011
Location: Kansas City, MO
My Boats: 2005 Baja 25 Outlaw SST
Posts: 93
Default

I run 20W-50 in the 496.
cmkworm is offline  
Reply With Quote
Old 05-01-2013, 06:35 PM
  #6
Registered
 
Join Date: May 2011
Location: Toronto, ON
My Boats: 2000 Baja 272, 454 Mag
Posts: 464
Default

Can't remember if I sent you the manuals or not. PM me.
puzzleboy is offline  
Reply With Quote
Old 05-01-2013, 08:42 PM
  #7
Registered
 
Nightlife1970's Avatar
 
Join Date: Feb 2006
Location: Decatur, Mi
My Boats: 1988 Baja 280 Force
Posts: 1,184
Default

After some reading in another thread. I think I am going back to a straight 30 weight oil. Been seeing some pressure drops after long runs I never had before untill I went with multi-weight oils.
Nightlife1970 is offline  
Reply With Quote
Old 05-03-2013, 07:45 PM
  #8
Registered
 
Join Date: Nov 2008
Location: Evansville, IN
My Boats: 2000 Baja Hammer
Posts: 50
Default

I'm a fan of Rotella 15W40 diesel oil. I tried straight 40wt in my boat (the selling dealer recommended) and it drank it! Maybe a quart every other weekend. I decided to switch it to Rotella and it stopped using oil... It's cheap enough and always available.
642MX is offline  
Reply With Quote
Old 05-03-2013, 08:42 PM
  #9
Registered
 
Join Date: Feb 2009
Location: Vancouver BC
My Boats: 97 baja 322
Posts: 100
Default

ive been using rotella 15w-40 and K&N filters on my 502 mags for a few years now and don't notice it burning much at all
Yoda_Man is offline  
Reply With Quote
Old 05-03-2013, 08:50 PM
  #10
Registered
Trade Score: (5)
 
Join Date: Mar 2008
Location: Traverse City MI
My Boats: Throttleman 36 Cig Gladiator "Unleashed"... Fast 33' Outlaw(sold)... Slow 40' Express Cruiser... 18' Kustom Cat... Pair of Kawasaki Ultra 150's... Superjet
Posts: 3,254
Default

I would run a stright 40 or stright 50 w oil. Like valvaline VR1 racing oil or kendal. Dino oil. No need for synthetic since us boaters change it so often. No need for a multi viscosity since we only boat in warmer weather.
offshorexcursion 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 07:32 PM.


Copyright 2011 OffShoreOnly. All rights reserved.