To answer the original question, a friend of mine has been using Mobil 1 in his Pacific Coast for the last 25,000 miles. He uses the auto version of the oil bought at Walmart. He has had no problems with his clutch. I asked him why he didn't use the motorcycle version, and he said he didn't know it existed.
Somebody mentioned Pennzoil. I used a lot of Pennzoil in my cars back in the 70s because it was cheap at the Pay'N'Save. That was until I tore one of the engines down. It was a Chev 283 and I had never seen so much sludge in an engine. Then I had to replace an intake maniflod gasket in my '75 F250 with a 360. Same story, so much sludge that you couldn't see the rockers under it. I ran into other engines that were sludged up, and they had the same common denominator. They had been run with either Pennzoil or Quaker State oil. I talked to a lot of others with the same experience and have been told it is because of the high level of paraffin in those two oils. I don't know if that is true and I don't know if those oils are the same as they used to be, but I don't use them.