Hello=)!! I am new to the site and the Lexus community. My 99 lexus gs400 is leaking a brown fluid. Not sure from where as it has had a transmission flush and radiator replaced. It also makes a weird rattling noise when started in the morning. And I have noticed a rougher ride at low speeds or when in reverse. Any suggestions?!?

 

Check your power steering and rack and pinion. The rettle at start may be a heat shield. As for the rough ride maybe tranny mount?

 

Thank you!! I will try those out and let you know.

 

What does it taste like?

 

LOL. Whatever you do, don't taste the differential fluid..

 

i would suggest checking all fluid first to find which is low, more likely to be an oil leak, if it will cause a rough ride at lower speed/ reverse could be valve cover gasket leaking,which could also be leaking on to spark plug. which will not arc the sprak efficient enough to burn you Air fuel mixtue.

 

Rearmain seal was cracked and new transmission mount needed.