I once changed the oil & filter on a DRZ but wasn't sure if I'd put the 'O' ring in behind the filter after I'd filled it with oil. Fortunately I have a grassy bank at about 45 degree's in the garden so I laid the bike down so the oil filter cover was pointing up, then removed it & the filter to check. I had left the 'O' ring out. put it all back together without loosing any oil. All was fine. But the DRZ is a fair bit lighter than a Tenere so just watch your back & anything that might break on the bike if you choose to lay it over.