Continued from page 40 ILSAC GF-5 vs. GF-6A
consisting of four stages: two steady state stages with transition ramp stages between them. Unleaded Halterman KA24E Green fuel is used for this testing. The contact surfaces on all 16 bucket lifters are measured using a surface profilometer for wear area and a 3D microscope for wear volume. Average intake lifter wear area and wear volume are the primary evaluated parameters. End of test used oil analysis iron.
Sequence VH (replaces VG) Figure 3: Spider web diagram comparing ILSAC GF-5 and GF-6A3 Engine Tests
ILSAC GF-6 is the first standard to ever include six new tests. Four of the tests are replacements, two of them are brand new and one test is carried over from GF-5. There is a total of eight engine tests. Each of these tests is meant to address an issue like LSPI or to meet requirements such improved fuel economy.
Sequence IIIH (replaces IIIG) The objective of this test is to measure lubricant thickening, oil consumption and piston deposits under high-temperature conditions. It was developed to simulate high-speed engine operation under relatively high ambient conditions. The engine used is a Chrysler 3.6L V-6 Pentastar fuel injected gasoline engine. Using unleaded gasoline the engine runs an 8 minute initial lubricant leveling procedure followed by a 5 minute slow ramp to speed and load conditions. The engine then operates at high load and 3900 rpm with 151 C lubricant temperature for 90 hours with 20hr stops for sampling and lubricant level checks. All six pistons are rated for deposits, varnish and stuck rings at the end of the test.
No wear criteria. Sequence IVB (replaces IVA)
The objective of this test is to evaluate the effect of an automotive lubricant on tappet wear for engines using direct-acting overhead cam valve trains. A Toyota 2NRFE 1.5L fuel-injected, inline four-cylinder engine with dual overhead cam shafts and four valves per cylinder is used. The test duration is 200 hours involving 24,000 30 second cycles, each cycle
42 LUBE MAGAZINE NO.153 OCTOBER 2019
The objective of this test is to evaluate the performance of a lubricant in controlling low-temperature engine deposits under operating conditions deliberately selected to accelerate deposit formation. The test was designed to simulate moderate-temperature taxi service, urban and suburban delivery service and commuter service. The engine used is a 2013 Ford 4.6L fuel-injected, eight cylinder gasoline engine with roller followers, coolant-jacketed rocker covers (to keep the temperature lower) and camshaft baffles. The test runs for 216 hrs. and has 54 cycles, each cycle consisting of three different operating stages. The fuel used contains a sludge precursor and engine blow-by is intentionally increased.
At the end of the test sludge deposits are rated on the rocker arm covers, rocker arm baffles, timing chain cover, oil pan baffle, oil pan and valve decks. Varnish deposits are also rated for the piston skirts on the thrust side and the rocker arm cover baffles. Clogging of the oil pump screen and piston oil rings are also rated along with the piston compression rings rated for hot and cold sticking.
Sequence VIE (replaces VID) /VIF (new) The objective of both of these tests is to provide a comparative fuel economy index (FEI) of the fuel-saving capabilities of automotive engine oils under repeatable laboratory conditions. Both tests use a 2012 3.6L V6 General Motors gasoline engine with external lubricant heating/cooling systems and a “flying flush” system for changing lubricants without engine shutdown. The test duration is 196 hours and fuel consumption is measured for six speed/ load/temperature test conditions compared to an SAE 20W-30 baseline lubricant. The test lubricant is introduced and aged for 16 hours before the first set of measurements are taken. The second set of measurements are taken after a further 109 hours of aging.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72
