I bought a 21" Exmark with a 6.5 Kawasaki engine. I went to change to oil and discovered the motor has no oil drain plugs. I called my dealer and they told me to turn the mower upside down to drain the oil. I advised them this was completely unacceptable. I called Exmark and they replaced the mower with a 5.5 Honda engine. Has anyone else run into this problem?