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Today I used a 5-quart jug of MaxLife 5w-30 that's been sitting on the shelf for about four years. I shook it vigorously for 15 seconds, let it sit upside down for a few minutes, and gave it another good shake before emptying the jug into the crankcase. There was some white residue in the...

2003 Infiniti QX4 VQ35DE 3.5L DOHC V6 101k miles; it was time to change out the factory plugs. Both valve cover gaskets were seeping slightly, so I changed them while I was in there. This truck is heavily short-tripped. OCI's for the past few years have been 4k-ish, whatever conventional I...

The ones where the thing in the middle doesn't pop up on it's own are bad, "collapsed", right? These are from a 2002 Ford 3.8L Windstar, if that makes any difference.

2002 Windstar, 146k on the clock. I've been chasing an intermittent misfire for a month or two. I've eliminated all of the usual (easy) suspects - plugs / wires / coil pack / vacuum leaks / EGR etc. Just did a compression test, results are #1 140 #2 140 #3 142 #4 140 #5 165 #6 80 What do you...

2002 Ford Windstar, 145k on the clock. Today my wife filled up the gas tank. Shortly afterward, it started running poorly. With no load, there is a slight miss when the engine is revved. Under load, there is an extreme miss (bucking, jerking) above 1500 to 2000 RPM. The check engine light is...