So I just happended to turn on the tele to Spike TV hoping for the powerblock, and what was on but some car chase with the Governator in a Spitfire or MGB or something I can't remember. He had a girl in the car with him and they were banging doors with, of all things, an early 911 Targa (with a tea tray spoiler but no other mods). Ahhnold drove the Targa up an embankment (they were in California, so it might have been Mulholland) and the Targa flipped on its side and came to rest in the road. The Terminator then proceeded to drive the red british sports car into a pole for some reason. He got out and interrogated the baddie in the Targa (read throw him off the cliff). He then pushed the 911 over onto its wheels, hopped in, and drove off with a J-turn. The funny thing is, when the Targa goes back onto its wheels, the driver side is all bashed up. When he does the J-turn you can see that the car is perfect.
Pretty good movie, actually. He kills several people and takes their cars each time. There are grenades, shoulder-fired rockets, guns, big explosions...
He ends up flying a flying boat out to some island. I think maybe one of the channel islands?
Movie is called "Commando"- 1985