The problem with this type of methodology is (archive)

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Posted by Steve on September 21, 1999 at 12:06:47:

In Reply to: Oil Analysis results posted by Jack on September 21, 1999 at 08:06:52:

The problem with this methodology is you may find out the oil isn't capable of "continued use" AFTER the damage is done to the engine.

: I had my oil analized last week and just got the results back.

: 1999 E46 328i 28,000 miles on the odometer
: 11,000 miles since last oil change with BMW synthetic 5W40
: (approx 50/50 highway/city)

: The reports states that the oil still falls within the spec'ed viscosity range (5W40)
: no trace of fuel, water, or antifreeze in oil.

: and traces of metals (aluminum, iron, copper and about 4 other types of metal) were all virtually non-existant.

: traces of silica (dirt) are also very minimal. (using K&N air filter) (there was a side note that said air filter is
: working properly)

: The conclusion of the report was that the oil is suitable for continued use and engine is in excellent condition.

: I think BMW engineers know what they're doing, and it'll be safe to go 15k to 18k before changing the oil.

: When it hits 18k, I'll send the oil in to be analized again and will post the results.

: Jack

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