Amsoil HP in E-TEC Marine Outboard
Q: A boat owner asks, Can I use Amsoil HP in an
Evinrude e-tech outboard? A: Yes you can i replied. Read our
Marine E-TEC Field Study below. Our Synthetic 2-Stroke marine Oil provides excellent protection in Evinrude engines
programmed to the lean-mix setting.
Overview Evinrude® E-TEC™ marine engines are unique in that they offer an alternative,
lean-mix setting that allows the engine to use less oil. Whether programmed to operate at the standard mix ratio or
reprogrammed to the lean-mix setting, these engines use sophisticated electronic equipment to monitor conditions,
including rpm and throttle position, to determine the appropriate gas-to-oil mixture. To use the lean-mix setting,
however, customers must have their engines reprogrammed by an Evinrude dealer and agree to use Evinrude XD100™ oil
exclusively, often at a higher cost compared to other oils. Bombardier Recreational Products (BRP®), the
manufacturer of Evinrude engines, has not established a performance specification against which to qualify other
oils.
Objective
Determine through real-world field validation if AMSOIL HP MarineTM Synthetic 2-Stroke Oil meets the
increased performance needs of reprogrammed Evinrude E-TEC engines operating on the lean-mix setting. Further
determine if consumers can safely use HP Marine Synthetic 2-Stroke Oil in E-TEC applications in place of Evinrude
XD100 2-Cycle Oil.
Package sizes include:
- Quart Bottle
- 1-Gallon Bottle
- 16-Gallon Keg
- 55-Gallon Drum
- 275-Gallon Tote
Methodology In conducting this field study, AMSOIL partnered with SEA-TOW®, a marine rescue
organization specializing in non-emergency calls for assistance. Based in Naples, Fla., SEA-TOW typically tows
large marine vessels, including yachts and sport cruisers. The engines that power their towing vessels routinely
encounter heavyduty, high-stress operation and provide the ideal environment for testing motor oils. Both Evinrude
250 hp E-TEC engines used in the study were initially operated on the standard oil injection setting for 28 hours.
An Evinrude dealer then reprogrammed both engines to operate on the lean-mix setting for the duration of the study.
The starboard engine’s oil reservoir was filled with AMSOIL HP Marine Synthetic 2-Stroke Oil, the portside engine’s
oil reservoir with Evinrude XD100 2-Cycle Oil. The validation period lasted a total of 534 hours; approximately 240
hours were spent under severe-service conditions when the SEA-TOW boat towed marine vessels. The engines were
closely monitored for the duration, and upon completion, both were disassembled and rated by a calibrated ASTM
rater who evaluated each engine based on NMMA TC-W3 criteria for two-cycle marine engines. Merit ratings for each
set of components (e.g. piston skirts, piston rings, etc.) were determined using the appropriate techniques and
rating scales as defined in the Coordinating Research Council, Inc. Deposit Rating Manual No. 20. The evaluation
included an examination of the condition of all engine parts. Some components received a merit rating based on a
1-10 scale, with 10 representing a component free of defects and 0 representing catastrophic distress. Others
received merit ratings indicating the percentage of an area with defects (e.g. the percentage piston skirt area
containing scuffing). The average merit rating of each group of components is shown in this study.
Piston Skirts
Portside using Amsoil HP____________________Portside side using Evinrude XD100
Starboard Side Using Amsoil HP_________________ Starboard using Evinrude XD100
AMSOIL HP Marine Synthetic 2-Stroke Oil
Piston Varnish 8.52
Piston Skirt Condition (scratching) 1.42%
Piston Scuffing 0.00%
|
Evinrude XD100 2-Cycle Oil
Piston Varnish 8.57
Piston Skirt Condition (scratching) 1.25%
Piston Scuffing 0.00%
|
The pistons in both engines received nearly identical high merit ratings for varnish, indicating both oils
excelled at inhibiting varnish formation. Scratching refers to the alteration of the skirt surface in the form of
sharp linear depressions from lapping of mating surfaces by fine particles suspended in the lubricant, fuel, air or
imbedded in a surface, while scuffing appears as a matte finish. The presence of scuffing is commonly
lubricant-related. In both engines, scratching was present at trace to very light levels, represented by the low
percentage ratings. Both oils completely prevented piston skirt scuffing, earning perfect ratings of 0.00 percent
scuffing.
Piston Rings & Lands
AMSOIL HP Marine Synthetic 2-Stroke Oil
Top Ring Sticking & Deposits 10.00
Second Ring Sticking & Deposits 10.00
Crown Land Deposits 3.98
Second Land Deposits 5.91
|
No
differentiation
is made between
thrust side and
anti-thrust side
for ring and land
deposits
|
Evinrude XD100 2-Cycle Oil
Top Ring Sticking & Deposits 10.00
Second Ring Sticking & Deposits 10.00
Crown Land Deposits 2.99
Second Land Deposits 6.82
|
Deposits on the piston rings can cause ring sticking and consequent power loss. The top rings and second
rings in both engines earned perfect merit ratings of 10.00, demonstrating no piston ring deposits. Merit ratings
for crown land and second land deposits were similar for both engines.
Cylinder Heads
AMSOIL HP Marine Synthetic 2-Stroke Oil
Cylinder Head Deposits 8.76
|
Evinrude XD100 2-Cycle Oil
Cylinder Head Deposits 8.14
|
Excessive cylinder head deposits are undesirable and can negatively affect engine performance. Both oils earned
high ratings for deposit control, indicating good cleanliness properties.
Piston Crowns &
undercrowns
AMSOIL HP Marine Synthetic 2-Stroke Oil
Piston Crown Deposits 7.02
Piston Undercrown Deposits 2.18
|
Evinrude XD100 2-Cycle Oil
Piston Crown Deposits 6.31
Piston Undercrown Deposits 2.66
|
While undercrown deposits do not impede performance, heavy piston crown deposits can cause preignition and
consequent poor performance. Two-cycle oils must resist heavy deposit formation on the piston crown caused by the
high temperatures inside the combustion chamber. HP Marine demonstrated strong performance in the area of piston
crown deposits.
Connecting Rod
Assemblies
AMSOIL HP Marine Synthetic 2-Stroke Oil
Wristpin: Condition/Deposits 6.82
Rod Bearing, Crankpins: Condition/Deposits 9.90
Rod Bearing, Wristpins: Condition/Deposits 8.38
|
Evinrude XD100 2-Cycle Oil
Wristpin: Condition/Deposits 8.38
Rod Bearing, Crankpins: Condition/Deposits 9.88
Rod Bearing, Wristpins: Condition/Deposits 7.62
|
Connecting rod assembly components are exposed to elevated temperatures and pressures that can rupture the oil
film, leading to metal-to-metal contact and wear. The wristpins, crankpin rod bearings and wristpin rod bearings in
both engines demonstrated trace to light levels of wear and were found to be in “good” condition according to the
calibrated ASTM rater. Deposits on all components were limited to levels not adversely affecting performance.
Connecting Rods
AMSOIL HP Marine Synthetic 2-Stroke Oil
Wristpin Bearing Race: Condition/Deposits 7.90
Crankpin Bearing Race: Condition/Deposits 9.67
|
Evinrude XD100 2-Cycle Oil
Wristpin Bearing Race: Condition/Deposits 7.98
Crankpin Bearing Race: Condition/Deposits 9.73
|
The wristpin and crankpin bearing races undergo constant rotational stress, inviting wear. Bearing races in both
engines demonstrated trace to light levels of wear and were found to be in “good” condition according to the
calibrated ASTM rater. Deposits were limited to low levels in both engines.
Cylinders
AMSOIL HP Marine Synthetic 2-Stroke Oil
Exhaust Port Blocking 1.08%
Exhaust Port Deposits 9.89
Cylinder Bore Scuffing 0.00%
|
Evinrude XD100 2-Cycle Oil
Exhaust Port Blocking 1.17%
Exhaust Port Deposits 9.88
Cylinder Bore Scuffing 0.00%
|
Carbon deposit buildup in the exhaust ports restricts air flow and can cause reduced power and poor
overall performance. Both engines displayed virtually no exhaust port blocking, represented by the low
percentages. Deposits were likewise minimal, with ratings near perfect 10s. In the area of cylinder bore
scuffing, both oils limited metal-to-metal contact and achieved perfect scores of 0.00 percent. The cross-hatch
pattern remains visible on the cylinder walls of both engines.
Crankshafts
AMSOIL HP Marine Synthetic 2-Stroke Oil
Crankshaft Crankpin: Condition/Deposits 9.85
Crankshaft Main Journal: Condition/Deposits 9.78
Evinrude XD100 2-Cycle Oil
Crankshaft Crankpin: Condition/Deposits 9.85
Crankshaft Main Journal: Condition/Deposits 9.78
The crankpins and main bearing journals experience elevated pressures during operation and
represent
common suffering points. In both engines, the crankpins and main bearing journals demonstrated trace to light wear
and were found to be in “good” condition according to the calibrated ASTM rater. Ratings for deposits were nearly
perfect for both engines.
Main
Bearings
AMSOIL HP Marine Synthetic 2-Stroke Oil Crankshaft Main
Bearings: Condition/Deposits 9.95 |
Evinrude XD100 2-Cycle Oil Crankshaft Main Bearings:
Condition/Deposits 9.89 |
The main bearings experience intense pressure and represent a common area where
metal-to-metal contact can occur. Both oils limited wear to trace to light levels and the bearings were found to
be in “good” condition according to the calibrated ASTM rater. Both oils nearly eliminated deposits as well.
Conclusion
As demonstrated in real-world, severe-service testing,
AMSOIL HP MarineTM Synthetic 2-Stroke Oil meets the stringent performance needs of Evinrude® E-TECTM marine
engines programmed for reduced oil consumption. Operated simultaneously with an engine lubricated with Evinrude
XD100, an identical engine lubricated with HP Marine demonstrated strong performance and excelled in
critical-component lubrication. The cylinder bores, for example, demonstrated 0.00 percent scuffing, while the
main bearings demonstrated only trace to light wear. The engine also displayed no ring deposits, earning perfect
merit ratings. Finally, HP Marine effectively limited deposits throughout the engine and met the increased
performance demands required by the lean-mix setting. Results prove the effectiveness of AMSOIL HP Marine
Synthetic 2-Stroke Oil in Evinrude E-TEC applications. AMSOIL fully
supports the use of HP Marine as a replacement for Evinrude XD100 in Evinrude
E-TEC engines, and warrants its use according to the AMSOIL Limited Liability Warranty
(G1363).
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