My LS430 is so quiet that I hear every little noise.Over certain bumps where the body flexes like over a large speed bump I hear a creaking noise from the doors. I was a mechanic for 22 years and was always good with noises,I have very sensitive hearing. I determined that the noise is coming from the many door weatherstrips the LS has to keep noise out. My 92 LS 400 had the same issue. I have used silicone spray lube which works but doesn't last very long. I have to keep reapplying it and it gets messy. Does anybody have a more permanent, longer-lasting solution? I was even thinking of using a thicker lubricant like a silicone grease but thought it might attract dirt and be messy. Has anyone else experienced this and possibly have a solution. I'm such a perfectionist, I wish I wasn't but it is what it is.

 

i use dielectric grease.you have to apply it to the top channel the one that the top of the window goes into.there isnt any perm fix for this.
i clean off the old grease and reapply.
everybody uses different stuff but i have been using this grease for over 30 years on my weather stripping.

 

Thanks for the quick response. I was under the impression that it was the large door frame weatherstrips causing the noise. Are you saying it's the one in the window frame making the noise? Also do I get the dielectric grease at a hardware store, Advance Auto?

 

yes you can get dielectric grease at any autoparts store.buy the big tube and it will last a long time.remember a little bit goes a long way.
get the clear stuff.