The TD5 engine is a famously heavy breather – and not in a good way unfortunately. Given we now have a shiny clean intercooler, it makes sense to try and keep it that way going forwards, rather than let the well intentioned (if a little half-arsed) attempt by Land Rover to “Greenwash” their engineering solutions by diverting the oil vapour (that would otherwise waft free) from the crankcase back to the combustion chamber (via the turbo, associated pipework, and intercooler). The intercooler fills up with oil and crap, and efficiency goes downhill thereby negating any “Greenness”. It’s a rubbish solution, especially when combined with the (obviously removed already) EGR system.
A far more sensible solution is to install a proper oil separator such as those used on trucks (not a catch-can, they are rubbish). Mann and Hummel make a particularly good one (Provent 200) that can be muscled into the TD5 Disco2 enginebay in a few places. By far the easiest option (and the one everyone else seems to have chosen) is to mount it on the firewall, behind the ABS valve block. Unfortunately this is also the only place that you can shoehorn a second battery, which I have done already — so it’s a non-starter.
My solution to the tetris challenge is to mount the Provent to the ACE/PAS reservoir (it’s very light – only a few grams) with a few chunky zipties. Rotating it so it’s on a nice jaunty angle means that using a silicone reducing elbow I can connect the outlet directly to the factory turbo intake pipe… nice and simple. The inlet is connected (again via a reducer) to an insulated braided hose run from the outlet on the rocker cover (the top of the engine).
The nasty oily vapour exits the rocker cover and flows down the braided hose to the inlet on the Provent. It enters the inlet chamber, where it condenses on a filter element, allowing nice clean air to exit the bottom hose and make its way to the engine air intake to burn up in the fiery hell of Solihull 5 cylinder combustion. The condensed oil flows down to the base of the Provent, and then out down a collector tube (a foot of clear silicone hose – clear, so I can see if there is oil collected) and remains there until I get around to crawling under the car, opening the tap, draining it into a cup, and putting it back into the engine… Now why didn’t they design it this way at the factory…? Could it be that cleaning out an intercooler is a nice profitable dealership service item? Surely not…