I had a K&N in my last Oldsmobile for a year or two. It had no effect on performance and economy but it did cause the O2 sensor in the air intake to become damaged by the oil. After replacing the O2 sensor, I threw the K&N out and went back to the factory paper filter.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970