HouseCallAuto 7/27/2012If you have no oil or coolant leak that could be causing premature starter failure then I do not know what esle to say, especially since you say that everything is fine until you get nothing. The only thing that comes to mind though which I have seen on other cars is that the starter has a small wire terminal that might be a "slide on" connection. Consider replacing that connector at the end of the wire that attaches to the starter terminal. remember,, the small diameter wire, not the fat one that supplies heavy battery feed. if the connector on the small wire has insufficient pressure in the contact and / or some corrosion inside the connector, that is a recipe for an intermittent no start / no crank / no noise situation which is then MISDIAGNOSED as a bad starter when it is in fact just a bad / poor connection.
Bill 7/28/2012Next time it doesn't crank try a remote starter switch to see if ignition related. That's my 2 cents worth.