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AMSOIL 10W-30 Excels in API
Sequence IIIF Test
 The
Sequence IIIF test is a stringent API SL, ILSAC GF-3 test
designed to measure oil thickening and piston deposits in
high temperature service, as well as provide information on
valve train wear. The test is designed to emulate high-speed
service under high ambient conditions.
Objective
Subject AMSOIL 10W-30 Synthetic Motor
Oil (ATM) to an independent API Sequence IIIF Test to determine
its effectiveness in preventing deposit formation and providing
wear protection in high temperature conditions.
Special Conditions
Because AMSOIL is formulated to provide
superior performance over extended drain intervals, testing
was allowed to continue for 240 straight hours, three times
the length of the standard Sequence IIIF test.
Test Procedure
Testing is conducted with a 1996 model
Buick 3800 Series II, water-cooled, four-cycle, V-6 engine.
The test engine is an overhead valve design (OHV) with a single
camshaft operating the intake and exhaust valves through pushrods
and hydraulic valve lifters in a slider-follower arrangement,
and it has one intake and one exhaust valve per cylinder.
Induction is performed through a modified GM port fuel injection
system with the air-to-fuel ratio set to 15:1.
Running unleaded gasoline, testing
begins with a 10-minute initial oil leveling procedure before
slowly working its way up to test speed, temperature and load
conditions. Testing continues at 100 bhp, 3600 rpm and 155°
C oil temperature for 80 hours with oil checks performed every
10 hours. Kinematic viscosity increase and wear metals (Cu,
Pb and Fe) are evaluated at every 10-hour interval.
At the end of 80 hours, all
six pistons are inspected for deposits and varnish, camshaft
and lifters are measured for wear and oil screen plugging
is evaluated.
Sequence IIIF
Test Parameters |
AMSOIL 10W-30 (ATM)
Triple Length (240 hr.) |
API SL Limits
(80 hr.) |
| Kinematic Viscosity, % Increase at 40°
C |
90.42 |
275 max. |
| Weighted Piston Deposit Rating |
4.51 |
4.0 min. |
| Average Piston Skirt Varnish Rating |
9.50 |
9.0 min. |
| Cam Plus Lifter Wear Average µm |
11.8 |
20 max. |
| Hot Stuck Rings |
0 |
None |
|
Test Results
Even at three times the standard test
length, AMSOIL 10W-30 performed three times better than the
test limit in the area of kinematic viscosity increase, and
it excelled in all areas of the test. AMSOIL 10W-30 Motor
Oil kept viscosity increase, wear, deposits and varnish to
a minimum. The pictures below demonstrate the superior protection
provided by AMSOIL Motor Oil throughout 240 straight hours
of Sequence IIIF testing.
While conventional motor oils
tend to thicken and lose their lubricating effectiveness,
AMSOIL Motor Oils are formulated to maintain their viscosities
over extended drain intervals. The results of the Sequence
IIIF test clearly demonstrate the long drain capability of
AMSOIL 10W-30 Motor Oil. Even after being subjected to a triple
length Sequence IIIF test, AMSOIL 10W-30 performed three times
better than the standard test limits. The competitor's motor
oil shows dramatic viscosity increase in less than half the
time.
|
|
| The greatest overall
load concentration and stress are placed on the piston
skirts and rings on the thrust sides of the pistons as
they move down, contributing to heavier deposits than
the anti-thrust sides. Even after being subjected to the
Sequence IIIF test for three times the standard test length,
the pistons (above) lubricated by AMSOIL 10W-30 Motor
Oil show minimal deposits and varnish. In fact, upon close
inspection, the original piston machine markings are still
visible on both sides of the pistons. This superior protection
provided by AMSOIL Motor Oils extends the lives of both
old and new vehicles, even in severe driving conditions. |
|
|
|
| Even at three times
the standard Sequence IIIF test length, the oil pan, screen
and valves showed no signs of deposits, oxidation or plugging.
By keeping engines clean and deposit-free, AMSOIL Motor
Oils effectively reduce wear and keep engines running
smoothly for extended drain intervals. |
Summary
The API Sequence IIIF test is a very
stringent test, normally lasting 80 hours, and is designed
to measure oil thickening, oil consumption, wear, and piston
deposits in high temperature service. It was performed by
an independent testing facility. AMSOIL 10W-30 soon became
the talk of the lab. That’s because instead of stopping
the test at 80 hours, AMSOIL requested it to be run three
times longer, for an unheard of 240 hours!
How significant is this? We
know of no other oil that has been subjected to this test
for that long, and the lab technicians had never heard of
it being done before, either. It’s difficult enough
for an oil to pass the test at 80 hours, and very few oils,
only good synthetics, could pass at double that, or 160 hours.
But to run an oil for 240 hours under those stringent test
conditions was totally unheard of. It was generally agreed
by those overseeing the testing, based on extended test data,
that the AMSOIL 10W-30 could have continued to run another
80 hours and still have achieved similar outstanding results.
The oil performed that well!
Pay particular attention to
the green “viscosity increase” graph above showing
viscosity increases. The competitive oil selected by the lab
was one they knew was a good performer in the test, and it
did well for the 80 hours the test is normally run, but at
120 hours you see it sharply increase in viscosity. Meanwhile,
the AMSOIL 10W-30 remains almost unchanged through the 240
hours of testing. This is why AMSOIL oils perform so well
during extended drain intervals. They stay in grade, even
under the most severe service. This extended service test
is proof positive of that!
Even after this severe extended
test, the engine was in excellent condition. The machining
marks on the cylinders were still prominent. There was absolutely
minimum wear and virtually no deposit formation.
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