My wife has a 2001 2wd auto xterra with the non supercharged v6 in it. I recently replaced the leaking valve cover gaskets to discover she also has what appears to be a leaking oil pan gasket now. Engine has a 195k miles on it. The starter is wet with oil. Drivers side is bone dry. I've verified it's not the valve covers again. It looks to me like I can take off the starter and a bracket on the drivers side and replace the gasket without pulling the engine but I'm not to positive. It also appears that there is a power steering fluid leak. Are there any common leak points for that?

Also, what needs to be done to this engine to make it last another 100k miles? Timing belts maybe?

Thank you for your help.

Tyler