The Sequence VG engine sludge and varnish deposit test is a fired engine-dynamometer test that evaluates the ability of a lubricant to minimize the formation of sludge and varnish depositsThe Sequence VG test is a cyclic test, with a total running duration of 216 hours, consisting of 54 cycles of 4 hours each. The test engine is a Ford 4.6L, spark ignition, four stroke, eight cylinder "V" configuration engine. Features of this engine include dual overhead camshafts, a cross-flow fast burn cylinder head design, two valves per cylinder, and electronic port fuel injection. A 90-minute break-in schedule is conducted prior to each test, since a new engine build is used for each test. Upon test completion, the engine is disassembled and rated for sludge and varnish. Average engine sludge and average engine varnish are calculated.
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