Piston Slap: To Test in 4WD…or Not?

Jonathon writes: Hi Sajeev, Long time reader, not a commenter though. I have simple situation, and a simple question. Last Friday my beloved, and owned from birth, 1995 Grand Prix GTP developed a head gasket leak. This is something I can, with father-in law help, tackle in the summer. However living in Northern Ontario, a driveway repair is just not an option right now. It's time for a new ride. Since all those years ago I did not give my wife (g.f. at the time) any option into the purchase, this time around it will be something we both are in love with. Sadly that leaves a V6 Mustang or the 2013 Genesis 3.8 out. Also we lost our niece at the beginning of the year in a highway car accident that killed three other teenagers (the quality of highway maintenance is now privatized and sub-par). Anyways, that has my wife eying a 4×4\awd even more then ever. Top on her list is a 2012 Wrangler Sahara Unlimited (bare bones except auto & A\C). The mileage for this is 16\20. Our car, new, apparently was 16\24. From our sleepy little city to Toronto is ~360km. At the current 1.28\l, it would mean another $14 there and back for one of our escapes to the big city. So the question I have is, when the EPA tested the wrangler did they do it in 4wd, so that we could expect to see better mileage, or 2wd, and that is what we should expect? Regards, Jonathan ps…anyone have any suggestions for a driveway mechanic preparing to replace a headgasket on a 1995 Pontiac 3.4 with DOHC? Sajeev answers: Oh yes, I certainly do have some suggestions! My first preparation? Take one of the larger wrenches in your tool box and use it to crack every finger on your hands…as this is what most GM service techs experienced when they had to work on the cool, yet terribly designed "Twin Dual Cam" motors when they were new. If you don't have the proper GM service manuals, better get them on eBay now…and start drinking, too.  Only then can you be ready for what nightmares lie ahead! That said, I truly admire you for keeping a GM-10 on the road.  While I didn't appreciate them initially, they have aged well. Kudos to you, sir! About your new vehicle concern: the EPA does indeed test 4WD vehicles in 2WD. So you can't expect any better mileage, that's the best the drivetrain shall give. But you are actually concerned about safety after a fatal accident of a loved one, the Wrangler is last on my list.  Compared to a normal CUV and maybe most SUVs, the off-road ready Wrangler is less confident in emergency maneuvers, and that cramped footwell might mess up your foot.  Get a car-based CUV instead, unless you must have the coolness only available in the Wrangler. Not to mention that most (all?) CUVs in the Wrangler's price range get better fuel economy too. Because, after all, you can't have your cake and eat it too.   Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you're in a hurry. from The Truth About Cars http://www.thetruthaboutcars.com

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