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Old 09-18-2010, 05:34 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Inadvertently, we have another "customer" who posted California LA smog test results (from this fuel-injector cleaner thread) which I'll re-use in the figures above.

The point is to compare our E39's and the value will be for others who follow. Another point is to see WHAT things (octane ratings, fuel injector cleaners, etc.) affect smog test results.

So far, lower octane improved numbers only slightly (study of 1); and injector cleaner worsened numbers slightly (another study of 1).

The first image below is the first test Bugratu took in Los Angeles on his 1997 E39 528i; the second (worse) is AFTER adding:
- Bosch 7402 spark plugs
- Air Filter
- Guaranteed to Pass Smog Test (CRC) fuel injector cleaner

Last edited by bluebee; 09-18-2010 at 05:38 PM.
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