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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.
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.
