Never seen this issue, but maybe it's a climate thing. Only place I've ever gotten rust without a PCV is right at the top of the dipstick, because the fine oil mist couldn't reach that high. Normally it's a giant cloud of oil mist inside your engine block whenever it's operating at any higher speed.without positive ventilation you do get some rust where the oil doesn't splash, though
also gray goop anywhere that doesn't get hot
PCV is the way to go though, from a pollution as well as a performance standpoint.
Agreed. It can't just be magically losing that much oil without it turning to smoke or ending up on the ground. Worn out valve seals don't even lose that much and create huge clouds on startup normally.But in either one of those scenarios it would be burning the oil and putting up a smokescreen but OP says it isn't .
I'd have the valve covers off already looking around for what the problem is