What did you do to your LS430 today?
#2611
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#2612
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Make sure it is not overfilled. My 2001 LS430 with filter manual says 4.8 quarts and valve covers will leak if I put more in. Look at where that is on the stick and that should be your high mark. Also change your pcv valve if not done in awhile. Don't assume they replaced the plug gasket but you or someone else verify that is not where the leak is coming from. Also if they did not replace the collapsible gasket at first the threads might be stripped from over tightening. It happens quite often.
#2613
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