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Ypou can run a return to the sump, but depends on the design of it and how you want it to work. I don't have a retun ya just remove the lines then chuck a bit of petrol/thinners in there and wash it out then rinse it with water empty it and fit it back on. Not to hard, to have it return to the sump you have to tap into the sump.

The oil lines come from the fittings on the rocker covers that normally re-circulate blow by. You can vent a catch can if you want, its a good thing to do when you get high oil pressure from big power, or bigger turbos etc, takes a bit of stress out of it all. Same with oil/air seperaters, i guess this is the main reason you fit a catch can to properly seperate the air form the oil and recirculate it back into the system, but i prefer to not do this and simply just get rid off excess oil in the can.

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