2000 Buick Regal GS, 250,000 Miles, Supercharged V6, Automatic Transmission. I'm trying to help my folks by rehabbing their 2nd car. My dad has always changed the oil and had the brakes done, but things like fuel filter, transmission fluid, etc has been seriously neglected. The cars runs ok now but it does need new plugs, filters, etc and some general TLC. The drivers side windows both just fell down recently and my dad has them being held up by duct tape. lol It also has a minor oil and trans fluid leak. So my list to work on the car so far is;
1) Fuel Filter
2) Restore oil additive (the oil was just changed so when I do change it, I'll use Valvoline High Mileage with Restore to hopefully slow down leak)
3) Trans fluid drain and fill (multiple times over the next few months)
4) Air filter
5) Plugs and plug wires
6) Window repair - I assume this is the track system that needs replacement but I'll have to open the door panel to see.
7) Radiator drain and fill
8) Supercharger fluid drain and fill
9) Intake cleaning
10) General cosmetic cleaning and vacuuming.
Can anyone else think of anything I would want to look at? I don't want to just throw parts at the car but if it's an inexpensive part (like a PCV valve) I would bet it's the original so I'll just change it. It still runs good even with 250K on the odometer so I think it's worth investing in a little bit. It's just used to get back and forth to work, almost all highway.
Thanks in advance for your assistance.
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The Japanese really gouge for some of their OEM parts, like CV axles and radiators 
Yeah, usually the American cars are too stupid to put a drain plug on their transmissions. The best example I can think of is with Ford/Mazda. They shared a lot of parts because Ford owned Mazda until just a few years ago. Anyway, an example is the 4-speed automatic used on many Fords and Mazdas in the early 2000's. The same automatic transmission was used on both the Mk1 Focus and a few Mazdas such as the Protege. Mazda includes a drain plug, but Ford does not 
GM also supplies automatic transmission to many expensive European cars. Those transmissions have a drain plug. Most of their domestic transmissions do not.
Rock Auto doesn't carry the NGK wires for your car, and I don't think they have the TG air filter, either. But Rockauto does have all the other parts you need. And the wires and air filter are easily available on eBay, Amazon, and many other places.
I'm not sure about the HM 5w30 being suitable for the supercharger. It probably is, but maybe not. But you can always keep that HM for the engine (since you said it does leak oil), and buy a quart of regular M1 5w30 for the supercharger. I think the supercharger only takes a few ounces of oil (nowhere near a full quart), so you can also save the rest of that quart to top off the engine.
