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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 m |
11.8 |
20 max. |
| Hot Stuck Rings |
0 |
None |
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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.
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