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Different colored valve cover coloration???LS400

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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!





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