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Old 11-16-2004, 12:35 PM
autozen autozen is offline
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Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225
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.

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