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Different colored valve cover coloration???LS400

land yachting

By land yachting
in 90 - 00 Lexus LS400

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land yachting

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Hi Guys,

I have been wanting to tackle the starter replacement on my 1993 LS400 with 110,000 miles for some time now, so I dove into it yesterday. After getting to the starter I decided to replace the valve cover gaskets as they were getting a little leaky-27 years is a LONG time for those rubber parts to be subject to that cycle of heating/cooling. So I pulled the first cover off and it had a nice baked on carmel colored oil patina, which is exactly what I had expected. The other side surprised me a bit because this patina was significantly less. 

What could be causing this? I have to believe that one side is getting hotter than the other, but why would this be? Or is there another explanation? 

Thanks for your help! Stay healthy out there!

Regards,

Kevin

 

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