Do you need to tilt the engine remove and replace starter on 1993 Oldsmobile silhouette 3800 series?

No, you generally do not need to tilt the engine to replace the starter on a 1993 Oldsmobile Silhouette with a 3800 series engine. Access is usually achievable from underneath the vehicle. However, it's a tight squeeze and can be challenging. You'll likely need to use a combination of extensions and swivel sockets to reach the starter bolts.