Our Sienna XLE developed an oil sludge problem despite oil changes every 3200 miles. The oil changes weren't made at the dealership, however, so Toyota initially denied warranty. Toyota also denied sludge problem with their engines. We spent thousands in repairs. Fortunately, an honest repairman at another dealership saw to it that we were comped a rebuilt engine. It also was a lemon, and the rebuilt one was replaced by the initial dealership. Nissan gave us $8700 on trade in, and we LOVE our Nissan. After 5 Toyotas and Lexus ... never again.