Season here is form late April till Mid-October.
So 4-6 months. I use it for fishing.
So 4-6 months. I use it for fishing.
Marine versus Automotive
- Thread starter NDcarper
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I used the Amsoil 4-Stroke Oil thes year and absolutely Love it.
My Suzuki 140 just sings with it in.
I have about 80 hours on it so far and should hit 100 hours this year.
No other Oil will go in it.
Just a darn good fisherman recommending a darn good tried & true oil.
My Suzuki 140 just sings with it in.
I have about 80 hours on it so far and should hit 100 hours this year.
No other Oil will go in it.
Just a darn good fisherman recommending a darn good tried & true oil.
Check your visoosity recommendation. 10w-30 is common for 4 stroke outboards.
Fuel dillution and foaming is another thing besides corrosion supposedly addressed in the new fcw spec. As the story goes, outboards run cooler than typical auto engines and often don't burn off the fuel in the oil. More fuel may be present from long low rpm operation (trolling). Crankcase volume can be small (they don't hold much oil). So small capacity, added to fuel dilution, added high higher rpms (wfo to the good fishing) can create more foaming. So supposedly the new fcw oils are better at dealing with theses issue. Yamaha just sent out some flyers about the whole issue to their dealers. It's nothing really new but it makes you think twice about using the old car oil in the new outboard or watercraft.
Hmmm, I wonder if GC 0W30 would be a good oil for my 25 HP Mercury???????
Thermostats for most outboards are 140º(some 160º).
Suzuki DF140 Specs 10w-40.
Copied below are technical properties for Amsoil 4-stroke marine oil and Rotella T synthetic oils. Interesting to note that Amsoil's viscosity index number is 154 and Rotella T's is 176. On the other hand, Amsoil's HTHS number is 4.6. Shell doesn't list the Rotella T HTHS figure, but I recall that it is around 4.1 or 4.2. Anyone know what the actual HTHS number is for Rotella T synthetic?
TYPICAL TECHNICAL PROPERTIES:
AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCF)
SAE 10W-40, API SL, NMMA FC-W
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)
14.1
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)
93.8
Viscosity Index (ASTM D-2270)
154
CCS Viscosity, cP @ (°C) (ASTM D-5293)
6871 (-25)
Flash Point °C (°F) (ASTM D 92) 234 (453)
Fire Point °C (°F) (ASTM D 92) 254 (489)
Pour Point °C (°F) (ASTM D 97) -46 (-51)
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)
6.40%
Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm,
1 hour, Scar in mm) 0.40
Total Base Number (ASTM D-2896) 10.5
HTHS (cP) 4.6
Humidity Cabinet Rust (ASTM D-1748) Pass
. . . . . . . . . . . . . . . . . . . . . . . . .
Typical Properties of Shell Rotella® T Synthetic
SAE Grade 5W-40
Product Code 54300
Viscosity:
@ -30°C, cP D 5293 6400
@ 40°C, cSt D 445 90
@ 100°C, cSt D 445 15.0
Viscosity Index 176
Flash Point, °C D 92 222
Pour Point, °C D 97 -40
Low temperature cranking viscosity cP @ -30°C D 5293 6400
Low Temperature Pumping viscosity, cP @ -35°C D 4684 39,000
Neutralization No.
TBN-E D 2896 11.5
Sulfated ash, wt% D 874 1.47
. . . . . . . . . . . . . . . . . . . . .
I don't think you would go wrong with Rotella T, but personally I am going to use the Amsoil 4-stroke marine oil when I'm done with the break-in period for my 6hp Tohatsu outboard because the Amsoil is NMMA certified.
TYPICAL TECHNICAL PROPERTIES:
AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCF)
SAE 10W-40, API SL, NMMA FC-W
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)
14.1
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)
93.8
Viscosity Index (ASTM D-2270)
154
CCS Viscosity, cP @ (°C) (ASTM D-5293)
6871 (-25)
Flash Point °C (°F) (ASTM D 92) 234 (453)
Fire Point °C (°F) (ASTM D 92) 254 (489)
Pour Point °C (°F) (ASTM D 97) -46 (-51)
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)
6.40%
Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm,
1 hour, Scar in mm) 0.40
Total Base Number (ASTM D-2896) 10.5
HTHS (cP) 4.6
Humidity Cabinet Rust (ASTM D-1748) Pass
. . . . . . . . . . . . . . . . . . . . . . . . .
Typical Properties of Shell Rotella® T Synthetic
SAE Grade 5W-40
Product Code 54300
Viscosity:
@ -30°C, cP D 5293 6400
@ 40°C, cSt D 445 90
@ 100°C, cSt D 445 15.0
Viscosity Index 176
Flash Point, °C D 92 222
Pour Point, °C D 97 -40
Low temperature cranking viscosity cP @ -30°C D 5293 6400
Low Temperature Pumping viscosity, cP @ -35°C D 4684 39,000
Neutralization No.
TBN-E D 2896 11.5
Sulfated ash, wt% D 874 1.47
. . . . . . . . . . . . . . . . . . . . .
I don't think you would go wrong with Rotella T, but personally I am going to use the Amsoil 4-stroke marine oil when I'm done with the break-in period for my 6hp Tohatsu outboard because the Amsoil is NMMA certified.
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