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I've been getting the UOAs for my 2008 Nissan Titan done at every interval. The high lead values keep bugging me. Its always had Amsoil Signature Series 5W-30 in it, along with an Amsoil filter. Oil change intervals have been right around 10k miles. The type of driving it sees is long...

A bit of background on this bike: I slowly started turning this 2007 SV650S into a track bike last year, and as a result, a significant amount of track miles are included in this interval. Track duty is rough on an engine, and the high metal counts attest to this. I assume that the slightly low...