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Another oil thread. [Went with BMW recommended]

10K views 107 replies 25 participants last post by  sprintman 
#1 · (Edited)
#86 ·
Here is another BMW approved oil, the document mentions some of the BMW engine test requirements:

http://www.top1oil.com/newsletters/2011/July.pdf

The BMW N52 test lasts 350 hours and is cycled through several stages to put heavy demands on the
lubricant. The high RPM cycle is interesting since it is kept near redline (6,800 RPM) for 50 hours with full load.
There are also several hours run at conditions to promote sludge formation in the engine. Furthermore,
there is a component that looks for aeration in the oil during operation as a critical parameter, since
aeration could increase wear. At the end of the test, the engine is disassembled and parts are rated for
wear, sludge, and varnish. This viscosity increase of the oil is also measured post-test.

The BMW N42 test is an additional and high tech wear test completed on a 4 cylinder engine on the
valvetronic valve train. With this test, wear to the metals is detectable by looking for radioactive isotopes
in the oil. This allows for fine and accurate wear rate measurements to be made.
 
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