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Common repairs for the LX:
Chrysler 300 / 300C, Dodge Charger, Magnum, Challenger

Oil grades and use. If you have the MDS system (Hemi engines only, and no SRT-8s), be sure to use 5W20 oil - note that many dealers will use bulk 10W30 or even 10W40, partly out of ignorance (“they really mean 10W40, 10W30 is too light!”) and partly because it’s cheaper - and some dealers know few limits in cheating a few more pennies from a customer. In order for the MDS system to work properly, which is to say to switch from four-cylinder to V8 mode instantly, you need to use 5W20 oil. Of course if the owner’s manual says something else, follow its advice - but don’t be convinced by a mechanic or oil-change place. Insist on the right grade and if they don’t use it...get a refund and go somewhere else. A technical service bulletin (TSB) - 09-015-04 and 09-013-04 - says: “Vehicles with the Multiple Displacement System must use SAE 5W-20 oil. Failure to do so may result in improper operation of the MDS.”

Shifter stuck in park. Joe Kosiner wrote: There is a problem with the shifter in some 2005-07 cars (especially the LX) that causes the shifter to remain stuck in park whether you depress the brake pedal or not. A plastic part in the mechanical lockout that is tied to the brake pedal breaks and you are stuck in park. Billet Technology sells a replacement part made from aluminum, so you don't need to replace the entire shifter (as some dealers apparently do, at high cost).

Hesitation when shifting. Some people are more sensitive to this than others...but sometimes it's a problem and sometimes it isn't. The engine computer automatically lowers torque when shifting to preserve transmission life. (Five-speed automatic only.)

Drained batteries. If the car battery drains while unattended, check the TSBs — certain stereos required firmware updates to avoid unnecessarily high power usage on standby.

That said, there is also a service bulletin covering shift hesitation during wide-open throttle on the SRT-8 cars. According to the TSB, when the gas pedal is floored, the engine RPM may go beyond the redline before the shift from first to second is made, so there’s a “short hard bump” as the shift begins. This happens in particular when the pedal is floored from about 15 mph; in essence, the computer can’t figure out at what engine speed to shift. The problem has been solved with new software, and only applies to cars built with the 6.1 liter engine before July 25, 2005.  The procedure should be done under warranty in about half an hour.

Also see: “Mercedes transmission woes” in this WA580 transmission article

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