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What we have here appears to be a cultural void that will never be bridged between those in North America and the rest of us, especially contributors from Europe.
A little context, if I may, since I went out on the road more than 30 years ago I have averaged nearly 40,000 miles a year, mostly in Company Cars, but there was a period of 8 years where I had my own cars doing that kind of mileage. Also, in my early driving days I had a series of older, more basic cars that required lots of weekend fettling.
When I had my Mk1 Ford Escort (3 shades of metallic brown) I did everything with the help of my trusty Halfords socket set and a few screwdrivers - new clutch, rear axle rebuild, water pump, brake rebuild, suspension swaps, new radiator on top of the regular fluid changes (Castrol GTX). Even when I had the means to buy new (Ford Fiesta Mk2 Pop Plus, Fiat Uno, Fiat Panda) these cars never saw a dealer, I did all the servicing and repairs at home so I knew they had been done properly!
The 8 year period of running my own cars for full business use ended when I got my PHEV nearly 3 years ago, but the European rules and regulations around a manufacturer's warranty, and the ease with which my insurance company could have got out of a claim by saying I had done something wrong, meant I always went for main dealer servicing. Also, if I had serviced the cars myself, my employer would have had terrible trouble proving their duty of care, as it was, producing a folder full of main dealer invoices, regular tyre and geometry checks, MOT's etc meant the Inspector took less than 30 seconds to pass that part of the audit.
It's a big world out there and we all need to understand that different things are more important in other parts of it. I have never heard of the oil analysis that our American cousins seem to use as easily as washing their car, my answer would have been to buy better oil, but it appears you can't. Equally, our European acceptance of rules and regulations is something those from North America will never understand, yet we draw comfort and strength from them as we know where we stand.
In the middle of all this is a car with oily bits that are mostly no different to other modern vehicles, hugely complex electric parts that can kill you, trying to satify users from the Arctic to the Tropics with hugely different regulatory arrangements, but you know the saying that 'You can't satisfy all of the people all of the time'; I think its doing pretty well all told.

Specific PHEV forum for the Mitsubishi Outlander PHEV.