Summary of Test Method CEC L-53-T-95

1 Test Synopsis CEC L-53-T-95 Evaluation of Sludge Inhibition Qualities of Motor Oils in Gasoline Engines (MB M111 E20) This test Method is designed to evaluate the ability of an automotive crankcase lubricant to inhibit the deposition of sludge and prevent wear in gasoline engines when operated on a fuel that is prone to generate such problems. Lubricants intended for use only in gasoline engines and those intended for mixed fleet application covering both gasoline and diesel engined vehicles may be evaluated by this procedure.

2 Sludge is the key parameter measured at the end of this engine test. Results of tests run under this Method are presented on a merit rating scale from 0 (extremely heavy sludge) to 10 (clean). Certain parts of the engine, the rocker cover, cylinder head, cylinder head front cover, timing chain cover and sump are rated individually and an average sludge rating is calculated from these separate numbers. The wear evaluation is carried out on both, the intake- and exhaust camshaft. The camshafts have to be pre-measured. The wear is to be determined by comparison of the pre- with the post-test measurement.

3 Lubricants giving satisfactory performance in this test, and meeting the other well established performance requirements, will give enhanced protection against the deposition of sludge when utilised in four-stroke gasoline fuelled vehicles in both normal and severe service. The test engine is the DaimlerChrysler M111E, a four-stroke type with an in-line four-cylinder configuration of litres, 16 valve, two overhead camshafts and electronic fuel injection. The engine is operated in four phases: 1. Cold section 0-48 hours 2.

4 Engine quality section 48-49 hours 3. Full load section 49-124 hours 4. Alternating section 124-286 hours The total test time is 286 hours but the duration of the alternating section (Phase 4) and the total test time may vary depending upon the severity of the fuel batch. A specially selected premium fuel is utilised, formulated to be critical with respect to the generation of sludge deposits but still representative of products available on the European market. (Physical properties within the specifications of EN228).

5 At the end of test the engine is disassembled and the critical parts allowed to drain before being rated for sludge deposits. Camshaft lobe profiles are measured for wear. Pistons are also rated for deposits and the freedom of piston rings is assessed.