The oil is well over 200 degrees, even higher with a Turbo, but even in places like Phoenix the separator is going to at least get most of the oil out of the vapor...with the high heat of the oil and underhood temps, and the short transit time of the vapors through the system from valve cover to can, the can would have to be chilled to make any real difference...and not sure even then just how significant the difference would be? I just know that driving here in SoCal, on mountain passes like through Tahoe the other day when it was in the 90s, that on only after a 1500 mile interval when I drained the can I got several ounces of oil out...oil that would have gone directly to the Turbo vanes/intake manifold and would have contributed to coking/sludge/unsavory stuff in general. Catch cans are instant gratification...Great topic. This post is not about to do or not to do, it is about the positive crankcase ventilation temperature AND ambient temp combo. I live where the sun is about 15 feet over my head and I wonder how important it is to control the temperature of the catch can. I mean, if it does not cool down to some extent won't a portion pass on thru as vapor and not be collected?
Pic showing heat shielding of a catch can from quick google search - I have no clue about their product. Attempt is to add some value to the topic.
https://www.heatshieldproducts.com/catch-can-heat-shield
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