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Engine Oil - Your thoughts?

Nathan Bryant

Active Member
Messages
15
Ratings
8
Points
43
Location
Loves Park, IL
Boat Make
Yamaha
Year
2012
Boat Model
AR
Boat Length
24
#1
Question for you...

This will be my first time changing the oil and I had the dealer do the 10-hour service. I have 40ish hours on the engines. The service manual doesn't call for anything specific but allows for 10w-30, 10w-40, 20w-40, or 20w-50. Yamalube's oil is a 10w-40 conventional oil. Given this is northern Illinois and the boat won't be in either extreme heat or cold, I'm thinking either 10w-30 or 10w-40. What are you running and had success with? Synthetic or conventional?

Thanks in advance...
 

Boat Crazy

Jetboaters Commander
Messages
1,212
Ratings
887
Points
198
Location
Lebanon Missouri
Boat Make
Yamaha
Year
2010
Boat Model
AR
Boat Length
24
#2
Reside in Missouri. Use 10-40 Yamalube with Yamaha filters. Based on what I have been told, my local dealership uses 10-40 in all their oil changes for boats. I saw no reason to switch.
 

Rigger

Jet Boat Junkie
Messages
415
Ratings
292
Points
148
Location
Lake Martin Alabama
Boat Make
Yamaha
Year
2013
Boat Model
AR
Boat Length
24
#3
10 hour change was yamalube. My next change will be Amsoil 10w-40 synthetic. Sticking with the Yamaha filters.
 
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#4
530 hours on a 1800 engine oil and filter changed every 50 hours, I use motorcraft filters and a 20- 40 blend in Florida. The reason I use a blend is I have been advised that over time synthetic oil won't stick to parts as long between use as conventional oil. For boats sitting extended periods between use having the oil stay on the parts is pretty important so I use a blend but Yamaha uses straight conventional oil , possibly for that reason. I know seadoo stopped recommending synthetic oil in their engines for that reason.
 
Last edited:

ToddW850

Jetboaters Lieutenant
Messages
1,396
Ratings
1,003 25
Points
173
Location
Destin, Florida
Boat Make
Yamaha
Year
2007
Boat Model
AR
Boat Length
21
#5
Down here in Florida also. I use Valvoline 10W-40 Conventional with Yamaha Oil Filters.
 

Rigger

Jet Boat Junkie
Messages
415
Ratings
292
Points
148
Location
Lake Martin Alabama
Boat Make
Yamaha
Year
2013
Boat Model
AR
Boat Length
24
#6
530 hours on a 1800 engine oil and filter changed every 50 hours, I use motorcraft filters and a 20- 40 blend in Florida. The reason I use a blend is I have been advised that over time synthetic oil won't stick to parts as long between use as conventional oil. For boats sitting extended periods between use having the oil stay on the parts is pretty important so I use a blend but Yamaha uses straight conventional oil , possibly for that reason. I know seadoo stopped recommending synthetic oil in their engines for that reason.
Interesting - makes sense!
 

tdonoughue

Jetboaters Commander
Messages
2,154
Ratings
1,427 20
Points
198
Location
The Woodlands, TX 77381
Boat Make
Yamaha
Year
2012
Boat Model
AR
Boat Length
24
#8
An other reason for conventional oil is that conventional oil wets the engine seals and causes them to expand slightly. Switching to entirely synthetic can cause the seals to dry over time, shrink, and small leaks to appear. Hybrids or pure conventional will avoid those problems by keeping the seals wetted.

Not an issue if an engine has had synthetic from day one. Then the seals have not expanded with oil and full synthetic causes no problem.
 

Hezi

Active Member
Messages
75
Ratings
25 2
Points
28
Location
Secaucus NJ
Boat Make
Yamaha
Year
2015
Boat Model
Limited S
Boat Length
24
#9
530 hours on a 1800 engine oil and filter changed every 50 hours, I use motorcraft filters and a 20- 40 blend in Florida. The reason I use a blend is I have been advised that over time synthetic oil won't stick to parts as long between use as conventional oil. For boats sitting extended periods between use having the oil stay on the parts is pretty important so I use a blend but Yamaha uses straight conventional oil , possibly for that reason. I know seadoo stopped recommending synthetic oil in their engines for that reason.
My 50 hrs oil change is due soon I'm glad I read your post since I was about to use 10w40 fully synthetic. Where can I get the blend you mentioned? Do I mix it myself? I'm 45 and working on automobile and motors since 12. All my life I herd "never mix synthetic with mineral". About 12 years ago I met Honda "chimist" in a dirt bike race and he told me he is using a blend to achieve best engine performance and longetivity. @Cobra Jet Steering LLC, you seems to be an expert. Please advise how can I obtain or make the mix for the motor oil. Mind you I'm in the northeast and during the long winter the boat is covered in an outside storage. Unfortunately, my busy work season is in the summer and even on nice weekend (which are not that often here) sometime I need to work. Definitely I'm falling into the category of a boat that sits longer than I'd like between rides. Thank you!
 

Cobra Jet Steering LLC

Jetboaters Admiral
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#10
Wal-Mart sells all sorts of oil I usually pick up my oil filters and oil there but I am sure you can get it in most automotive parts stores Life is only as complicated as we make it I like to keep it simple.
 

2kwik4u

Jet Boat Junkie
Messages
1,490
Ratings
1,099 26
Points
143
Location
Georgetown, IN
Boat Make
Yamaha
Year
2017
Boat Model
AR
Boat Length
19
#11
There is zero issue switching between synthetic and conventional at will. That is a terrible myth that I wish would just go away. Similar misunderstanding exist about warping brake rotors (it's actually a buildup of pad deposits you feel), and "sucking in water" on hot trailer bearings when dunked in cold water (What the hell are you doing with bearings that hot anyway?).

Anywho......go read this->>https://jalopnik.com/heres-the-difference-between-synthetic-and-normal-motor-1826240884

That's a great article with two great videos anyone should watch if they have any confusion.
 

Hezi

Active Member
Messages
75
Ratings
25 2
Points
28
Location
Secaucus NJ
Boat Make
Yamaha
Year
2015
Boat Model
Limited S
Boat Length
24
#12
Wal-Mart sells all sorts of oil I usually pick up my oil filters and oil there but I am sure you can get it in most automotive parts stores Life is only as complicated as we make it I like to keep it simple.
Any chance do you know the serial # the original filter is crossing to a generic one? I want to go to Walmart :)
 

Cobra Jet Steering LLC

Jetboaters Admiral
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#13
I use fl-910s Motorcraft there are many compatible filters and a lot of hot headed opinions about what one is better or not, as for me I use what ever I find works well and I put more hours on motors and harder hours on motors than the majority of people do.
So ask me a question you get the answer agree or disagree makes no difference to me . Do a search on filters someone listed a bunch that were all compatible this one is the one I have used for many thousands of hours over many years with numerous Yamaha 4 stroke 1800 engines supercharged and non supercharged. And I NEVER USE SYNTHETIC OIL and NEVER WILL but that's just me and it won't change as for anyone else they can use what they choose . It matters not to me. And I agree that there is no reason you can't change from synthetic oil to regular oil if you so desire. I just cringe when the oil filter subject comes up I was asked what I use and I answered that question , therefore I gave the correct answer.
 
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McMark

Jetboaters Commander
Messages
1,247
Ratings
1,235 29
Points
183
Location
Monongahela, PA
Boat Make
Yamaha
Year
2015
Boat Model
AR
Boat Length
24
#16
I use yamalube 10-40 W (for watercraft) and just switched to the motorcraft 910s filter. It’s a nice proper fit. The yamalube has high ZDP (basically zinc)that helps the oil stick to parts when not in use. Previously used Yamaha filters till this season.
 

Danielmailin

Jet Boat Junkie
Messages
244
Ratings
301 1
Points
128
Location
Homestead, Florida
Boat Make
Yamaha
Year
2016
Boat Model
FSH Deluxe
Boat Length
19
#17
Yamaha engines are not energy efficient engines and use normal old engine lubrication technology, that is why if you look in the manual the SPI specifications it pointa to old conventional or synthetic blends that match the spec.
Avoid full synthetic energy efficient oils for these engines or any engine that does not require it.
It may say it meets and supersedes, but it does not contain the zinc materials in the oil the old engines, marine engines and diesel engines need for lubrication.
 

2kwik4u

Jet Boat Junkie
Messages
1,490
Ratings
1,099 26
Points
143
Location
Georgetown, IN
Boat Make
Yamaha
Year
2017
Boat Model
AR
Boat Length
19
#18
........ but it does not contain the zinc materials in the oil the old engines, marine engines and diesel engines need for lubrication.
This is a valid reason for not using Synthetics. I would caution a blanket statement though, some Synthetics have high zinc content, some don't. So many different formulations out there now.
 

rsg1963

Jet Boat Addict
Messages
330
Ratings
206 2
Points
93
Location
Dublin, Ca.
Boat Make
Yamaha
Year
2016
Boat Model
AR
Boat Length
24
#19
I use Amsoil Marine 10-40 and Yamaha filters but would use a K&N without hesitation as I have used those on my Kawi 300X fo0r over 5 years without issue.
I see a LOT of mis-information about synthetic oil here and am surprised it's still being repeated. But old beliefs die hard. And truthfully, any quality oil will do just fine. Non-synthetics have come a LONG way since the old days.
 
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