1999 Jaguar XJ8 help?

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  • etjoyride
    0:-1
    • Mar 2005
    • 2149
    #1

    1999 Jaguar XJ8 help?

    Alright, so i am looking to get a 1999 jaguar XJ8. I already have one picked out and have talked ot some family about it and everything, the only problem i am having is gas. I know that it is supposed to run on premium, however i have heard of jags, mercedes, and other similar luxury cars running off of midrange gas. So i am wondering if anyone knows if this car would run alright off of midrange gas, and whether or not there would be any noticable affects.

    Thanks everyone
    Tags: None
    • Lohman446
      Useful posts: 7
      • Jun 2003
      • 9315
      #2
      If you can't afford the $3.00 a tank difference in fuel you cannot afford the car. Those numbers are there for a reason. Don't buy an expensive car and then go cheap on fuel, its ridiculous.
      "Unless someone like you cares a whole awful lot, nothing is going to get better. Its not" - Dr Suess

        Comment

        • etjoyride
          0:-1
          • Mar 2005
          • 2149
          #3
          i CAN afford it, i just do not want to if it is not necessary, seeing as the money does add up.

            Comment

            • Lohman446
              Useful posts: 7
              • Jun 2003
              • 9315
              #4
              Fine

              Higher octane fuel burns at a higher temperature, it also does not ignite at as low of compression (compression being able to take the place of heat).

              In general vehicles designed for higher octane fuel have a higher compression ratio. Lower grade fuel stands a chance of preigniting, that is igniting from the force of compression as the piston comes up rather from the spark of the ignition system.

              Since the computer has a detonation sensor it will detect this and adjust timing accordingly. So those of you who do it or tell you "I do it and it doesn't ping or anything" really don't understand how their ignition system works with the computer. If you are lucky the computer will flip on a check engine light, but most of the time it does not as it is operating within parameters.

              Short term this causes higher fuel usage and may actually work out to more $$ per mile than just using the right fuel in the first place.

              Long term this allows unburned exhaust gasses to enter the exhaust system and the catalatyic converters, as well as allowing too much fuel to be in the engine on the next cycle. Long term this is detrimental to very expensive converters, the oxygen sensor before and after (or catalatist efficiency monitor for you Ford folks). Further the increased temperature from it in the engine compartment will actually disallow your fuel to atomize as well, which may further contribute to lower mileage / performance.

              Its also possible that this unburned fuel over time manages to seep past rings and into the oil. Fuel is not a good lubricant. Though not enough to notice short term the influence on engine life can be detrimental.

              Your dealing with a car that maintenance on will already be expensive. Why would your risk raising these costs over a few dollars saved, even a few hundred a year. What is the cost difference between premium and midgrade? Its not enough to take the risks.

              This does not work in reverse folks. Running premium in a vehicle not designed for it and without the compression factor gains you essentially nothing, and can actually increase the running temperature of your engine.
              "Unless someone like you cares a whole awful lot, nothing is going to get better. Its not" - Dr Suess

                Comment

                • etjoyride
                  0:-1
                  • Mar 2005
                  • 2149
                  #5
                  alright lohman, thank you. that is what i was trying to find out. Shortly put, It will be cheaper in the long run to just use premium considering that i would have to replace several expensive parts.
                  Thank you

                    Comment

                    • Lohman446
                      Useful posts: 7
                      • Jun 2003
                      • 9315
                      #6
                      Originally posted by etjoyride
                      alright lohman, thank you. that is what i was trying to find out. Shortly put, It will be cheaper in the long run to just use premium considering that i would have to replace several expensive parts.
                      Thank you
                      You take the chance, yes. Ironically due to the system changing timing and the increase in temperature from preignition it is possible that its cheaper in the short run to run premium due to a decrease in mileage from using lower grade.
                      "Unless someone like you cares a whole awful lot, nothing is going to get better. Its not" - Dr Suess

                        Comment

                        • etjoyride
                          0:-1
                          • Mar 2005
                          • 2149
                          #7
                          Thank you. i ithnk i am going to hold off on getting a car like this for a while until i am completly sure tha ti can afford the gas and maintenence.

                          This was simply my second choice for a car seeing as how i cannot currently get a '67 mustang.

                          Also, i am going to ask you another question in the near future via PM if you do not mind.

                            Comment

                            • Lohman446
                              Useful posts: 7
                              • Jun 2003
                              • 9315
                              #8
                              Originally posted by etjoyride
                              Thank you. i ithnk i am going to hold off on getting a car like this for a while until i am completly sure tha ti can afford the gas and maintenence.

                              This was simply my second choice for a car seeing as how i cannot currently get a '67 mustang.

                              Also, i am going to ask you another question in the near future via PM if you do not mind.
                              I don't mind .
                              "Unless someone like you cares a whole awful lot, nothing is going to get better. Its not" - Dr Suess

                                Comment

                                • etjoyride
                                  0:-1
                                  • Mar 2005
                                  • 2149
                                  #9
                                  Thank you, by the way that was your 7th useful post considering that you just saved me from a very costly mistake

                                    Comment

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