In my Opinion, installing an oil catch can purpose doesn't have an effect on the engine oil change interval naman. What it really does is to prevent or minimize oil gunk or sludge accumulation in the intake manifold and intake valves of the engine. Now if we will really goes into details it somehow improves din naman nga pala kse having a good unobstructed air flow to the combustion system e.g. piston will have a good combustion and less unburned fuel that can seeps into the pistons and contaminate the oil, but that is on the long run and not an immediate effect. I've always been practicing my calculated risk approach based on past observation and experiences and have always been doing an oil change every 10K km or 1 year which ever comes first with the exemption of brand new car first 2years I follow the Casa recommendation during the sensing stage if the car is a lemon or not...after that kahit pa nasa warranty nag 1 year interval na ako irregardless of warning ng service advisor. Bottom line its up to you sir,depending on your risk appetite.

In my old cars>10years na seldomly used using as well ZIC oil I even go further than 1 year, so far no issue naman. Oil still looks good, though I don't have the technical actual specification of the oil condition but my sense tells me oks pa naman. An extended oil interval naman with less mileage risk really lang naman is a high TAN which I don't think with the new mettalurgy of the engine will not really have that much effect on it, sa mga gaskets and seals perhaps. But those are am willing to take the risk.