You can't (not legally, anyway)
Yes
Buick never officially made a Presidential Edition Regal, but you still might try nada.com to get a close estimate
Remove the wiring harness from the bottom of your 1987 Buick Regal power antenna. Remove the power antenna retaining nuts. The power antenna will come off. Reverse the process to install the new power antenna.
The 1981-87 Regals, save for a few trim piece differences and such, were virtually identical.
I was just under the hood of an 87 regal. The fuel filter was on the right side of the engine (passenger side of the car), next to the carbuerator. If you take the air cleaner off you should be able to see it...it say "fuel filter" right on it.
it may not be easy but it will fit because I have a 87 Buick gn motor in an 87 s-10 so it will fit.
Any windshield washer tank from a GM A/G body would work - Chevy El Camino (1978-87), Malibu (1978-83), Monte Carlo (1978-88), Buick Century (1978-81), Regal (1978-87), Olds Cutlass Supreme (1978-88), Pontiac Grand Prix (1978-87)
87 octane
No, 87 octane is sufficient
There are 1760 yards in one mile. Therefore, 87 yards is equal to 87/1760 = 0.0494318 recurring (that is, 0.04943181818...) miles.
87
Technically any G body from 78-87. This would include the Malibu, GMC Caballero, Olds Cutlass, Monte Carlo, Buick Regal, Pontiac Grand Prix, and 81-83 Grand LeMans.