S4 questions

[Scott 20191668 Bermes <scottb2460@earthlink.net>]

I looked at a nice (they all are) '93 S4 in Atlanta today and wanted to
know a few things.

1. Were trip computers options, this one didn't have one.
2. Do the S4's have the UFO brakes
3. The "antilock" icon was lit on the dash, but couldn't find the
antilock on/off button on by the hazzard/heated seat switches.
4.  Are oil changes and 15k/30/60k/90k services about the same price as
servicing the V6's?

Appreciate any info.

Scott