10w-30 or 25w-40 oil for 150 pro xs

4WD

$50 site donor 2023
Joined
Sep 21, 2010
Messages
20,148
Location
Texas via IAH
A number of boaters who do hours of trolling prefer the 25W40 …
Sold my last boat in December and just found two gallons left …
Just not sure what it’s good for outside of boats ?
 

Texcl2

Thread starter
Joined
Feb 15, 2021
Messages
116
I spoke to mercury today, they said that since I’m in a cooler environment I need to stick with 10w-30 but if I were to move to a hot climate the best oil would be 25w-40 synthetic blend and if I switched I need to stick with that oil. I asked why the sea pro used 25w-40 oil and he said it was because it’s meant for commercial duty. I asked what the difference in the blocks were and he stated the sea pro is a de-tuned 150 to run reduced rpms. Seems a little contradictory but I guess if a motor is pushing around heavy loads all day long you don’t worry so much about cold starts(?)
 
Joined
Jul 5, 2019
Messages
475
Location
STL, MO
Seems contradictory to me as well. You stated that you never go out unless it's 50+. This would make me personally lean towards the 25w40. Either way, I do not think a 10w30 is going to cause you any misfortune. Thank you for posting Merc's response!
 
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