As the forum porter I hate doing old vehicals parts when the customer doesn't clean out the upper and lower manifolds. The oil and sludge build up is disgusting. Does this kill a motor? No. Of course it could last 200k but at what engine compression and leak down and HP over time?? You are 100% building a film which will decrease the intakes air volume. That's a no argument statement which will lead to lower HP right there. Also, nasty blow by oil vapor sludge getting sucked down into a motor on the wrong side of the piston rings is not where I want nasty blow by oil vapor sludge. That's going to contaminate the crap out of the piston heads, valves, spark plugs and lower the fuels octane. These areas want 100% air and fuel and nothing else! Also that dirty vapor isn't going to keep your cylinder walls clean and keep the rings working as good as they should over time. I've run e85 for a short time. It's amazing to look down into the motor and see the difference in cleanliness after the ethanol eats everything clean. Luckily I've had catch can since day 1 and cleaning the inside of the engine wasn't that hard. However catch cans don't work great. Recently I've switched to an air oil separator and the amounts of caught oil is night and day. Here's a pic of less than 100 miles, maybe 50...
Now add that amount up over 200k that needed to be burnt up where it shouldn't be! There's a reason why on top gear they dyno older cars and they always say "lets see how many horses have escaped". Even after a tune up its still down. I've never seen them gut and engine and clean its parts thoroughly.
If you're not going to buy an air oil separator then you need to vent a catch can to atmosphere.
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13 370z-
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