I am planning to perform an oil change on my 1992 LS400 (bought used). Where is the oil filter located? Is it accessible without jacking up the car?

 

The filter sits approximately directly below the drivers seat. Need to jack up the car, need to remove the plastic cover at the bottom of the engine compartment, quite a few bolts . And, the filter will likely leak, so be prepared.
My suggestion, order a manual from the factory. Alot of tidbits that will come in handy.
Good luck with the new ride.