Hey guys,


I bought this intake kit:

Mercedes Diesel Performance Air Intake Kit 300D | eBay

Probably way overpriced, probably could've made a DIY one for way less, but I really like it and it looks great in the engine bay, also gives the turbo a sweet sound.

The shorter, upper separator gets the actual oil to the oil return line and the blow by to the longer tube. The longer collector vents the blow by out and collects any oil that makes it out. The collector just vents out into a long hose which you just kind of tuck under the battery tray into the back of the engine bay.

Great design IMO, but I have one of those engines that despite having terrific signs of life, just has a bit more blow by than it should. I've learned not to worry, but the tube just vents it out into the engine bay and makes my engine bay kinda smoky when the car is running.

Not a huge deal, but something I'd like to maybe resolve. I had an idea of going down the exhaust, and drilling a hole in the mid-pipe region, and getting a little threaded tube fitting, then just mounting a longer hose to the collector and running the hose to the fitting on the exhaust. This would just vent the blow by into the exhaust and out the back of the car.

Is this a good idea? As in, would I have to worry about the exhaust trying to push its way up the tube and into the collector, thus creating pressure in the whole system? Or do you think the exhaust would flow by it and let the blow by just flow in with it?

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1984 Mercedes-Benz 300D