The Oasis was sold with a 2.3L VTEC engine, which was also found in 6th generation Odysseys.
The odd thing about the Oasis is that it was a better buy than the Odyssey, but it sold worse due to low brand recognition. The retail price for the Oasis was typically a thousand dollars or less than the Odyssey, and the Oasis came with a better warranty. Keep in mind that these were essentially the same vehicle.
The 1999 Oasis is the only one that is different than its Honda counterpart from the same year. The Honda Odyssey went into a new generation for that year, while the Oasis stuck with the same 1998 design with minor insignificant adjustments.
These minivans had flat-folding third row seats. Although common in many new minivans, the Oasis and Odyssey were the first.
There are plenty of these reaching the used minivan market. The great thing is, few people realize that they are the Honda Odyssey with a different badge on the front. You can get some great deals on these minivans, and they last about as long as a new Ford will. That's why so many of these are used in large capacity taxi fleets, including those in New York City. For the best deals, look on eBay, and don't buy a former fleet vehicle, they get roughed around too much.