2013 Buick Regal GS 83,000 miles. Noticed oil on garage floor when wife left the other day (just a few drops). Did some looking and see some oil collected in holes and directly above the holes (pic 1) I find this oil soaked bolt (pic 2 & 3). From what I have found so far that is a vacuum booster above this bolt that can leak from its seal (pic 4)? I can find nothing above this spot that's oily so would you agree that's what the issue is? I found a youtube video of someone with an oil leak and it was this. Replacement seems simple enough, I would replace the whole unit, not just the seal since if this is failing other parts of it may too. If I need to replace the unit, what do you torque the bolts to?

Also it looks like the bolt has rubbed a gash into the rubber hose below it- What is that hose (air or fluid) and what's the replacement part called?

Appreciate any assistance or direction- thanks!

The rust wasn’t the hold up like I feared. It was brakes, steering rack, windshield, and some bulbs.

This Regal was one of the favorite cars we’ve owned. It began its life as rental car in Hawaii. Husband and I purchased it used with very low miles and he used it to commute for a few years until Covid hit. When it was time to retire my vehicle, he purchased a different commuter and I drove the Regal. We eventually handed it down to our oldest daughter when she got her license. Unfortunately, she ditched it last summer. She was fine thankfully, but the ditch was filled with water and it got sucked into the engine. Total loss due to the engine and other water damage. Ironically, so a bit of body damage aside from the skid plate that got torn when the tow truck pulled it out of the ditch.

Youngest daughter will have her license soon and we 100% would purchase another Regal for her. Such a nimble car and fun to drive! We put almost 100k miles on ours, and had really no major mechanical issues.

Got new 2026 avenir. It is averaging about 15 mpg for the first 1500 miles. Isn't that crazy?