PeachParts Mercedes-Benz Forum - View Single Post - Is this a factory setup

Jeremy5848 · #9 02-09-2009, 10:40 PM

Correct. The original "trap oxidizer" was replaced every 30,000 miles by dealers at no charge to the owner. In the early 1990s, Mercedes came up with a permanent replacement, the "trap catalyst." It was, AFAIK, the same size and was installed in the same location as the trap oxidizer. This location is below and slightly to the rear of the turbo. It accepts exhaust from the manifold at the rear of the engine and delivers it to the turbo, which sits more forward than the Federal turbo. The turbo also sits higher, leaving no room for the air filter, which therefore has to go in the corner of the engine compartment, all the way forward on the passenger side. Since the air filter is unique to this version, it is pricey, but the air filter casing is more rugged than the federal version and does not rattle apart. The California version also has a different crankcase ventilation system and does not have an oil drain from the air cleaner to the oil pan; the crankcase fumes are sucked directly into the turbo intake.

Jeremy