I’ve had my '98 LS400 up here in Canada and it’s mostly solid, but the check engine light keeps flickering. The VVT-i valves can be sticky, so watch for rough idling. Otherwise, it’s a dream to drive—smoothest ride ever!
I’ve got a 98’ Lexus LS400 in Miami, n USA. Had a bit with the AC compressor – total pain. Engine pitfalls are common too. Lucked out with maintenance. Anyone else fix the AC drama? 
Let’s swap stories! 
I had a '98 Lexus LS400 up in Toronto, Canada. Had issues with the catalytic converter filling up the shop. And the oil leaks weren’t any picnic. Always had to keep an eye on the transmission fluid too – trust me, it sucks!