Oil in the tube? Lexus says no worries
When performing service on a 2008-2011 Lexus LX570, traces of engine oil may be found on the ignition coil boot and in the bottom of the spark plug tube.
Wipe the oil residue from the surfaces prior to reassembly.
According to Lexus, there are no secondary effects of the oil seepage due to component sealing, and no part replacement is necessary for this condition.