Premium Gas For 2000 & 2001 Chrysler 300M's?

Discussion in 'Chrysler 300' started by John Gregory, Nov 12, 2003.

  1. John Gregory

    John Gregory Guest

    Does the owner's manual for either of these two cars call for premium or
    regular gas?
    John Gregory, Nov 12, 2003
  2. John Gregory

    Steve Stone Guest

    89 octane is called for.

    It will run on premium if your willing to pay for it.
    Steve Stone, Nov 12, 2003
  3. John Gregory

    John Gregory Guest

    Is 89 "regular" or is it "87"?
    John Gregory, Nov 12, 2003
  4. John Gregory

    Steve Stone Guest

    In the NorthEast 87 is regular, 89 is Mid Grade
    Steve Stone, Nov 12, 2003
  5. John Gregory

    Lloyd Parker Guest

    87 is regular, 89 is midgrade.
    Lloyd Parker, Nov 13, 2003
  6. Never heard that one before. Why? Do you have an independent reference
    for this? Using premium is a waste of money if it isn't needed, but
    I've never heard of it causing harm ... other than to your wallet.

    Matthew S. Whiting, Nov 13, 2003
  7. John Gregory

    damnnickname Guest

    Do not use premium fuel if it does not call for it, it will do more harm
    then good in the long run, higher octane fuel will leave carbon deposits on
    the heads/pistons on vehicles that require low octane, and could cause
    drivablity problems
    damnnickname, Nov 13, 2003
  8. John Gregory

    Art Begun Guest

    I believe the owner's manual recommends against premium for the
    regular 300M engine but haven't looked lately and my memory isn't what
    it used to be. I stick to the recommended mid grade which it
    definitely states in the manual. That much I remember.
    Art Begun, Nov 14, 2003
  9. John Gregory

    MoPar Man Guest

    Been feeding my '00 M with 87 octane pretty much since day 1 (which is
    4 years 2 weeks now). That even includes the time-frame when Shell
    Canada was supplying bad gas that was gumming up parts of the fuel
    system that Chrysler cars were for some reason more succeptible to
    (and yes I get about half my gas from Shell stations).

    While on the topic of the M, what are other owners doing about

    - coolant replacement
    - brake fluid replacement
    - battery
    - timing belt
    - spark plug replacement
    - fuel injector maintanence
    - differential fluid
    - power steering fluid
    - anything else?

    Aside from the differential and PS fluid which was changed this past
    summer, everything else on the car is original. K&N air filter gets
    cleaned and oiled about twice a year, and oil+filter gets changed 3
    times per year.

    I'm wondering what others are doing about plug replacement and
    injector cleaning. Anyone throw a bottle of injector cleaner in the
    tank (good idea, won't hurt or help, or bad idea) ?

    Anyone have to get a new battery for their M yet? If so, what year -
    and how many miles?
    MoPar Man, Nov 14, 2003
  10. John Gregory

    Greg Johnson Guest

    Depends on where you are. What you said is generally true at most altitudes. At
    higher altitudes, 85 is often regular, and 87 is midgrade. (Detonation is less
    of a problem when the air is less dense (because there is less air to compress)).
    Greg Johnson, Nov 14, 2003
  11. John Gregory

    Lloyd Parker Guest

    Premium hurts nothing but your pocketbook.
    Lloyd Parker, Nov 14, 2003
  12. John Gregory

    Bill Putney Guest

    You need to visit the 300M Enthusiasts club - $15, access to FSM
    microfiche parts catalogs, and other stuff online.

    Their forums (300M ezBoard) are broken down into very specific
    categories, such as, one on changing spark plugs, another on tires and
    wheels, one on brakes, a forum on nothing but black trim and
    wetherstripping, transmission, etc, etc., etc.

    You didn't mention changing the tranny fluid and filter - you definitely
    need to do that. 60 to 80k mile intervals should work well.

    P.S. fluid would be flushed and ATF+4 used for refill (Chrysler dealers
    can't get the branded P.S. fluid because Chryler says to sub. ATF+4).

    Coolant: Chrysler antifreeze or Zerex G05 (the aftermarket brand same
    thing) - supposed to not have certain issues that the orange stuff
    (Prestone Extended Life™/DexCool™) has.

    I have seen not a single post on injector problems, so they apparently
    are very problem free, but I throw some Techron™ or Marvel Mystery Oil
    in the gas every once in a while as routine/preventative maintenance.

    (BTW - mine's a Concorde not an M, but same car mechanically, except for
    my 2.7L engine).

    Bill Putney
    (to reply by e-mail, replace the last letter of the alphabet in my
    address with "x")
    Bill Putney, Nov 14, 2003
  13. John Gregory

    Bill Putney Guest

    Oops - that's $15 to join and have access to the info. and other bene's
    (Club decal, etc.).

    The forums are open to the public. Great bunch of guys.

    One guy has broken into the 14's with simple mods.

    Bill Putney
    (to reply by e-mail, replace the last letter of the alphabet in my
    address with "x")
    Bill Putney, Nov 14, 2003
  14. John Gregory

    Art Begun Guest

    My 99 is still on original battery though I had my dealer pull it and
    clean terminals once when I was getting other things serviced.

    Just had belts replaced. Noticed some tiny cracks in ac belt so had
    both replaced.

    Engine used to make a grind at low speed. Chrysler TSB says it can be
    the belts. It went away with new belts. Also I've noticed that
    engine is trifle quieter when oil is slight over fill mark and very
    noisy if slightly under min mark (happened once to me when I wasn't
    checking oil). Starting to wonder if stick is off.
    Art Begun, Nov 14, 2003
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.