Now owning a house, 2 cars, looking after MrsT and Little MissT and no longer doing shift work, I can't spend weekends under a car.
Yet everybody else manages to find time. I too own a house, own 3 cars, and don't do shift work. Yet I have time, despite the fact I suspect I have far more demands to deal with.
We all have choices, and yours is to take your car to those nice, honest people at VW, because there are awfully trustworthy, and pay their very reasonable charges to change the oil (and maybe even the filter if you're really lucky). You are prepared to lose that money in depreciation and running costs, in return for a badge on a vehicle that's hard to desire or justify. As said, that's entirely your choice
But please stop berating everyone who can manage their time and dare I say even enjoy working on their cars, as you have for the last 10 years. That's their choice