I took my 2002 Xterra with 95,000 km into the dealership three times over the last three months complaining of a oil leak. I drive about 3000 km a month and the warranty is just about up. The last three times they told me there is nothing wrong. Last week I noticed more oil on the garage floor and contacted a different Nissan dealership to have a look at it. They called today and said they have to replace the rear seal! Is it normal for a rear seal to go with around 100,000 km? Anyone else with this issue?