Sixdown

Where in a real engine does something like that occur. They're only using this to make you believe that Royal Purple is superior...it's all about additive packages, especially seeing how they didn't show this over an extended period of time. I use Redline Oil for most of my performance cars, and I'm running it in my LS400 too. Has a far superior additive package, higher HTHS viscosity, etc. I can't even find Royal Purple data sheets for their oil.

What should I do if I bought my car with the tachometer needle snapped off? I haven't had that needle for ages. Should I assume that I need to buy an intact used cluster and most likely get that repaired?

Quick note. I had popping noises coming from the rear of my car whenever I applied the brakes and subsequently released them. It ended up being a somewhat stuck caliper piston which returned to normal position slower than it should have after applying the brakes. I rebuilt the caliper and it no longer pops when I released the brakes.

Let me just say that the concerns over switching from dyno to synthetic oils are pretty much myth, granted older generation synthetic oils did occasionally cause leaks. Most modern synthetic oils have enough additives to prevent shrinkage of seals. I proved the point by switching to synthetic at 257k miles on my LS400 and have yet to see a single leak. I've done the same numerous time on old BMWs too.

I had a similar problem with my LS400 about a month ago. It turned out to be one of the three large oval fuses under the driver's side kick panel, below the steering wheel. They're behind the normal colored fuses. All I did was remove the covers, push down on the metal contacts, and reinstall them, and everything worked again. If this doesn't work, you may need to replace the oval ones. Some say that all you need to do it stick a metal wire through the small holes on the top of the fuses, push down, and release, and they get back to work. I didn't try this method. Here's the diagram of the fuse box I am mentioning: Hope this helps

I've been having problems with my 1990 LS400 Power Steering too. The PS has air bubbles in the fluid, which points me to believing that there's a leak somewhere, yet I still cannot find it. Would this O-ring be the source? There is nothing on the alternator.