Thread: 1989 W126 300SE Passed Emissions Test
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  #5  
Old 11-16-2004, 11:35 AM
autozen autozen is offline
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Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
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Also using a grade of fuel other than supreme in that model can increase NOX by more rapid burning. The jury is still out, but someone posted here a few months ago about failing NOX as a gross polluter until he changed his radiator. I want to test that theory, but the 88 and 90 300SELs I have been fighting with have been failing in the HC category.

Peter
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