Someone posted here that the tow package includes 70w 140 synthetic oil in the rear end.

Mine came new with the tow package and it does not come filled with the heavy synthetic. Even the manual states that.

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'05 CRD Sport born on 06/20/05, bought on 9/23/05, L.O.S.T. on 9/27/05 - modding ever since:

Daystar 2.0" Lift, P255/70R16 Revos, Boulder Bars, Reese Front Hitch w/9k Hooks, Poison Spyder Rock Ring, MOPAR Skids/Bug Shield/Roof Rails/Mats, WARN Hitch Shackle(Rear), 10k Hitch Hook(Front), Custom Tilt/Slope Meter, Ammo Box Mod, Rotella T 5W-40.

Because within Chrysler (and all manufacturers, I think) the last 8 characters will uniquely identify the vehicle within a period of time.

For a 2005 KJ vehicle:
5W123456

5 = Model Year (2005) - It changes to A when the numbers are up.
W = Plant Code W=Toledo North Assembly Plant
123456 = 'Serial Number' counted in the order they are ordered, not actually built

Sure it isn't completely unique since the model year repeats evey 30 years or so. The 17 digit VIN wasn't defined by the feds all that long ago, back in the 70s as I recall...any collectors know when it started? However 30 years from now they'll be able to tell if you're talking about your 2005 CRD or your 2035 Jeep Bio-Diesel Plug-in Hybrid Interplanetary Hover Craft.

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1998 TJ Gasser - Just for fun!

Sold in January 2012:
2005 Sport CRD
New to me March, 2007 w/22k miles
165,000 miles and still going strong
Factory Tow Package, Added Courtesy Lamps,
New Style Mopar Fuel Head,
Cooper Discoverer ATR
Mopar Slush Mats (JUNK!), Fumoto Oil and T-Case Drain Valves