Yep, oil on the exhaust or engine block. When I had my oil changed last the same thing happened to me. Smell will last 4-7 days. About the revs, I wouldn't worry about that. The auto preludes are 4 speeds, so at highway speeds, instead of being in 5th gear at like 1500-2000 rpms, they will be in 4th gear at 3500 rpms or so. It is just geared differently than a 5 speed is. Oh, and my friend down the street from me has a 93 prelude automatic with 198,000 miles on it, so I wouldn't worry too much as long as you take care of it.