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I actually don't know what changes the feel of oil so I know I'm not gonna be able to convince you that I can feel the oil getting old. Usually 1 oil change for me is about 2 trips to cali to track or mountain passes + some driving in town.
I think this is really a prospective issue.
To me the possible reasons for oil feeling old are
1. Dirt, I live in Vegas, there is a huge amount of dirt. I can pop any interior panel open and there is gonna be a layer of dirt/very fine dust. Ya, Nevada & South Cali........ tumbleweed & dust devil. I'm sure my engine sucks in a ton.
2. Heat Cycling the oil? Usually for me to go to track means 8 hours round trip to Cali track plus another 8 hours on track, so 16 hours of straight driving. I usually do this or just simply enjoy my time doing canyon runs within the first 2000 miles after I change my oil.
I'm kind hard on my car while I'm on certain roads, I don't really shift till redline & does tons of engine braking for the entire length I'm on that section of the road.
I drove the entire section of Mt. Hamilton HW130 staying near redline. *Humfrz you said you love that road.
PS:* Most of the time I only drive 5 miles over speed limit on public highway & I don't race others..... >___> If i encounter someone on those mt pass i slow down and build space till i can have a go again.
PSPS: I'm not counting metal shavings in oil cuz i have magnetic oil filter and drain plug.
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