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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 |
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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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