I bought a new 37ft triple slide Pace Arrow in 2004. W22 chassis was more than enough for the coach and had a good ride. I had some oil pressure issues with the 8.1 but it was just a sending unit for the most part. The WH rep I was working with told me the 8.1 only ran 6 psi normally. It used about a quart of oil between 3K mile changes and had no leaks so that bothered me as well. I would be a little concerned with it now as they are no longer in production. Biggest issue I had was BRAKES or should I say lack of. When the abs sensors would fry the trans would not shift right. After 6 years I got rid of it.