If you're thinking about getting one of these, check out my post under the "Mann Provent 200 CCV Filter" thread. From the experience on my CRD, it looks like there's too much airflow going thru the CCV system for a Model C to effectively stop all the oil. they have a larger Model D, but it has a taller collection jar on it, and I don't know as yet if one of these would fit in the space available. I've contacted the guy that manufactures these, and he's going to get back to me with some more info.

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Mitchell Oates
'87 MB 300D Diamond Blue Metallic
'87 MB 300D - R.I.P. 12/08
'05 Sport CRD Stone White
Provent CCV Filter/AT2525 Muffler
Stanadyne 30 u/Cat 2 u Fuel Filters
Fumoto Drain/Fleetguard LF3487 Oil filter
V6 Airbox/Amsoil EAA Air Filter
Suncoast TC/Shift Kit/Aux Cooler
Kennedy Lift Pump/Return Fuel Cooler