Watch this video on the LS460 to get a taste of what owning the LS600h will be like.
Good news is that unlike the 460 the valley plate leak is much less common on the 600h but it does suffer from the front left timing chain tensioner rattle. The issue is well documented and I believe Lexus themselves came out with a TSB in 2016 to address it. Didn’t really do much for the LS600h which stopped production in 2017 but did help the RCF and IS500 and all the cars with thr 5.0 V8.
High mileage isn’t too much of an issue for the LS600h, just make sure that it has had a transmission fluid service if buying 100k+ miles and the plugs have been changed.
Most important control arm to check is the lower front control arm due to the air strut and steering knuckle both being connected to it. If it goes bad it’ll wear out all your other control arms. The car has 4 control arms per wheel and they’re not cheap so set aside some money for new arms if they have never been changed.
Air struts can also go bad, they’re £1k a pop from Lexus but doesn’t go bad often, again will cost you dear if they all go. Consider going to springs if more than 1 go bad.
Fuel economy isn’t the best, expect low 20’s driving in town and low 30’s driving on motorway.
Funnily enough I’m considering selling mine and going to electric. You fancy a LS600hl?