My NX has been running Mobil 1 for 190,000 miles. I take it to redline everyday and try to autocross it once a month. The engine pulls like it's just been broken in and I hardly do anything besides change the oil and add go-fast goodies to the car. So in a nutshell, synthetic kicks ass.
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Paul
'92 NX2000 w/ mods
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Paul
'92 NX2000 w/ mods