I consider buying a 2018-2020 Regal Tourx with AWD, 8-speed A/R, 2.0L turbo, etc. Please comment about this drivetrain with over 100k miles. Is premium fuel mandatory? TX!

Did not see an edit button, sorry, I suspect there'* a time limit to edit. Let me try this again:

I consider buying a 2018-2020 Regal TourX spec'd as follows, all standard with all trim levels: AWD, 8-speed A/T, 2.0L turbo. Please comment about expected drivetrain issues with over 100k miles.

Is premium fuel mandatory?

TX!

Yep, all edits must be saved within five minutes of the original time each message was posted. This was implemented in order for people to not be able to "change history" after stirring something up. Nothing personal, it just fixed some behavior back in the day.

Like many cars, it depends on how it has been treated all its life. Is it an elderly person'* car that was treated nicely, maintained diligently, and comes with stacks of receipts? . . . or are you buying from a dusty auction lot with no other knowledge of it? . . . or something in between?

You might want to get a warranty on it.

The Regal TourX is a badge-engineered Opel or Vauxhall Insignia. I haven't heard much about the TourX at all, except that owners generally love them and many magazines have done different versions of "It'* such a cool car, this is a Buick???" articles. They didn't sell many of them in the US, and all of them were sold recently, so that could be related to why few problems are heard on them. Looking at problems on the 2018+ Opel/Vauxhall Insignia, I don't see anything glaringly bad.

Since it is small engine, turbocharged, and we don't know its history, I would suggest high quality full synthetic oil, and change it often, like every 3,000-4,000 miles.

From page 227 of the 2018 manual:



. . . so none of that 85-octane swill in Colorado.

YW!

Very good!

I presume all the same applies to the Regal Sportback, same years.

Someone posted at a GM forum his Sportback (or TourX) was crash damaged (circa '22 IIRC) and GM lacked a needed body part, something like a pillar or what not. I presume, production numbers being low, there is a concern for new body and interior parts supplies and not a big recycle selection either. OTOH barring a crash such risk is low; I drive only about 4k/miles annually now.

Yes, body parts availability will be slim for exactly those reasons. I think you have as good a picture as possible on this!

I haven't looked at parts lists or anything, but I took a cursory look at Buick Regal TourX and Opel Insignia side by side on my screen. They look like they are exactly the same except for silly-looking fender flares on the Buick and the badges are different. If you did find yourself with a smashed one and no body parts available, you might find that you can repair it into an Opel- or Vauxhall-badged version of itself after waiting for a shipment from across the pond.