I'm looking at the airfilters on my M120 engine. It appears that as this engine is installed into the SL600, MB had to make a significant compromise to filter size. The car is essentially sucking its air through a filtered cigeret. There just is no room for proper sized filters. It seems that this engine would probably respond well to a K&N filter element.

Might anyone have any before and after dyno data of an SL600 or S600 using a standard and K&N filter. Iv been hearing all sorts of BS stories and snake oil claims but I would like to see some hard numbers.

John Roncallo

John, is the M120 equipped with MAF sensor(s)?

it is and i would avoid any non OE style filter, to avoid damaging maf sensors, since they list over $500.00 each

__________________
1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins

It is equipt with MAF sensors one on each side. Is it the MAF sensors that are critical to filter oiling or the O2 sensors. It's got 4 O2 sensors.

My plan was to use the K&N filters dry.

John Roncallo

it isn't just the oil that damages the maf's, if they are dry then particles pass and those will also damage the sensors, so either way save yourself some money and headache and stick with original paper filters.

__________________
1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins