Transmission Problem

[khoefer]

I have a 1993 Ls400 and the transmission started acting up finally it would go a couple feet then stop pulling so I changed the filter and the fluid (no metal shavings or particles). I drove it that night no problems, then the following night It stopped pulling again, it will pull fine till it warms up then just stops. I used Castor oil Import multi-vehicle transmission fluid, Is that ok or do I just need to stop waisting time and invest in another transmission, it has 265,000 on it, mainly high way miles. Got it from my dad in 02" with 140k on it. It basically sat when he had it like all his toys do. Anyone with experience on this please share, thanks.