 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Nissan / Nissan Cars / June 20052005 Murano
Just purchased a 2005 Murano SL AWD and would like to know if using premium grade gas is really necessary or will using regular be ok. Owner's manual isn't very clear except to say that for best performance use high test, won't be racing just city driving. Thanks Any vehicle 1995+ needs premium. The car will start knocking if you put the cheap stuff in. Jim Rojas > Just purchased a 2005 Murano SL AWD and would like to know if using > premium grade gas is really necessary or will using regular be ok. Owner's > manual isn't very clear except to say that for best performance use high > test, won't be racing just city driving. Thanks > Any vehicle 1995+ needs premium. The car will start knocking if you put the > cheap stuff in. Huh? > Jim Rojas > >>Just purchased a 2005 Murano SL AWD and would like to know if using >>premium grade gas is really necessary or will using regular be ok. Owner's >>manual isn't very clear except to say that for best performance use high >>test, won't be racing just city driving. Thanks  SignatureRob Munach, PE Excel Engineering PO Box 1264 Carrboro, NC 27510 > Any vehicle 1995+ needs premium. The car will start knocking if you put the > cheap stuff in. > > Jim Rojas Umm, where did you get that from? Signature"Network management is like trying to herd cats." -- Unknown "I wonder how much deeper the ocean would be without sponges?" -- TazAmd - Humor Section Gettingtogather.com BTW, nice choice of vehicle. I like the copper color myself. Jim Rojas > Just purchased a 2005 Murano SL AWD and would like to know if using > premium grade gas is really necessary or will using regular be ok. Owner's > manual isn't very clear except to say that for best performance use high > test, won't be racing just city driving. Thanks You will probably get different responses on this. However, join up at www.nissanmurano.org (free). This topic has been discussed in detail there, and test results provided. Octane level is an indication of the anti-knock compounds present. When it is knocking, performance is de-rated, and the chance of missfire increases. More misfire means more pollutants, less efficient operation and less power. Short answer, higher octane level equals less knocking (as already mentioned) and better gas mileage (as well as better performance). > Just purchased a 2005 Murano SL AWD and would like to know if using > premium grade gas is really necessary or will using regular be ok. Owner's > manual isn't very clear except to say that for best performance use high > test, won't be racing just city driving. Thanks > Short answer, higher octane level equals less knocking (as already > mentioned) and better gas mileage (as well as better performance). you are correct, but before everyone starts filling there trucks with premium and not noticing any difference, this is only true for a motor designed to run on higher octane fuel, mostly the higher performance type. On 4/11/05 9:35 AM, in article wZu6e.43968$UW6.26651@bignews5.bellsouth.net, > Just purchased a 2005 Murano SL AWD and would like to know if using premium > grade gas is really necessary or will using regular be ok. Owner's manual > isn't very clear except to say that for best performance use high test, > won't be racing just city driving. Thanks If it's anything like my G35 (same engine), they "recommend Premium for the best performance", but regular is OK. However I used regular ONCE And you could tell the difference - rougher idle, not as smooth, etc. No thanks. > Just purchased a 2005 Murano SL AWD and would like to know if using > premium grade gas is really necessary or will using regular be ok. Owner's > manual isn't very clear except to say that for best performance use high > test, won't be racing just city driving. Thanks You REALLY want to use premium with these engines. Your mileage will be better with premium, so the additional cost is offset..somewhat. Seriously, unless you want costly repair bills in the future, use premium. >>Just purchased a 2005 Murano SL AWD and would like to know if using >>premium grade gas is really necessary or will using regular be ok. Owner's [quoted text clipped - 4 lines] > better with premium, so the additional cost is offset..somewhat. Seriously, > unless you want costly repair bills in the future, use premium. What basis do you have for that statement? Yes, the performance and possibly the mileage will be better, however, it is unlikely a manufacturer would design an engine to be damaged if premium is not used. That is what a knock sensor is for. SignatureRob Munach, PE Excel Engineering PO Box 1264 Carrboro, NC 27510 Not directed to me, but I will take a shot.... Knock = misfire misfire = unburned fuel unburned fuel = higher Catalytic Converter load Knock = engine load until knock sensor de-rates performance (pulls timing, adjusts fuel mixture, etc) = more computer timer ticks associated with correcting an un-needed situation that could be devoted to other tasks in the task manager. I stand a fairly good chance of surviving the Flu or whatever virus is going around. However, that doesn't mean that I try to devote all of my time trying to catch it. Running regular on a system (engine, computer, firmware, software) that is designed for optimum performance using premium isn't exactly russian roulette, but it does get the gun and the bullets together within close proximity. I don't think the manufacturer considers optimum performance the same way that you may. It is more likely that the term "optimim performance" to them is a reference to the least amount of performance necessary to pass EPA regulations consistently, and keep the engine and drivetrain together during the awarranty period. As an example, on a 2004 PT Cruiser GT, it is possible to go from 215HP to 245 HP by merely using more agressive computer firmware ("Calibration"). Absolutely no extra parts needed. You merely swap out the PCM (computer) and this only due to the dealer not being authorized to flash the stock one with the performance "calibration" (new firmware). If you buy the "Turbo Lite (180 HP GT), the same firmware change takes it from 180HP to 245HP. FWIW, that engine is good up to 800 HP with only a turbo change and more agressive calibration. From 800 HP to 1300 HP, the valve orientation has to be changed. So, in essence, a 215HP production car is capable to giving 245 HP to the consumer with computer changes, and up to 800 to the racer with increased scroll area on the turbo, and computer change (possibly 10 to 20% increase in injector flow) and up from 800 to 100 HP after cracking the head bolts (for the first time) and changing the valve orientation. I use that as an example of how seriously the potential of an engine design is cut back to preserve warranty and assure CARB approval and consistent results within EPA guidelines.... And, with OBDIII just around the corner, this will get even more pronounced in computer control to lessen the liability of the manufacturer.. Your mileage may vary.......... >>>Just purchased a 2005 Murano SL AWD and would like to know if using >>>premium grade gas is really necessary or will using regular be ok. [quoted text clipped - 9 lines] > manufacturer would design an engine to be damaged if premium is not used. > That is what a knock sensor is for. In all of the schooling I've been to as a mechanic they have never told me or have I ever have had (spark) Knock (predetonation) to be explained to me as a "misfire". I've been taught it is fuel burning (exploding) too early as the piston is not ready for down travel yet and primarily egr and ignition timing is added to counter act as the knock sensor picks it up. Premium fuel burn slower which is why we don't have the explosion so early, with is also why in below zero weather cars with premium fuel start harder than if they had regular. > Not directed to me, but I will take a shot.... > [quoted text clipped - 60 lines] >> manufacturer would design an engine to be damaged if premium is not used. >> That is what a knock sensor is for. > In all of the schooling I've been to as a mechanic they have never told me > or have I ever have had (spark) Knock (predetonation) to be explained to > me as a "misfire". I've been taught it is fuel burning (exploding) too > early from high combustion temps under load > as the piston is not ready for down travel yet and primarily egr and > ignition timing is added to counter act (cool the combustion chamber) as the knock sensor picks it up. > Premium fuel burn slower which is why we don't have the explosion so > early, with is also why in below zero weather cars with premium fuel start > harder thought I would add those too lines to better explain after I read my own writing. Your description is far better (and far more accurate) than mine in referring to it as minfire. I tend to use that as a catch all phrase for any condition that deviates from proper fire at the proper time. If I remember right, the actual definition (or manifestation) of the percentage of misfire shows up as Nitrides of Oxygen measured at the tailpipe - But it has been almost 30 years since I was actively involved in the auto tune-up market, and my brain is foggy.... >> In all of the schooling I've been to as a mechanic they have never told >> me or have I ever have had (spark) Knock (predetonation) to be explained [quoted text clipped - 11 lines] > thought I would add those too lines to better explain after I read my own > writing. >Just purchased a 2005 Murano SL AWD and would like to know if using premium >grade gas is really necessary or will using regular be ok. Owner's manual >isn't very clear except to say that for best performance use high test, >won't be racing just city driving. Thanks Bill, Congrats on your new MO! I picked mine up two weeks ago today. So far, it's the best vehicle I've ever owned! How about you? During the delivery "talk", my salesman (for all his opinion was worth) pointed out what the manual said regarding fuel requirements, then said, "Premium fuel is *not* REQUIRED and, in my opinion, it isn't worth the extra price. I'd stick with at least 91 octane, though." Well, in my area, regular is 87 octane, mid-grade is 89 octane and premium is 93 octane. Hmmm... Just my opinion (as well as what I'm doing): Aluminum engine + high compression engine = Premium gasoline For what I paid for this vehicle, I'll pay the extra few cents to keep it running strong. Signature<<<SgtRich>>> Chicago, Illinois, USA 2005 Nissan Murano SL AWD If you want to squeeze the best fuel economy out of it, try to keep below 2000 RPM in all driving conditions; whenever possible. That seems to be the engine speed that it likes. It took me a few tanks of gas to find the sweet spot after getting my Murano. >>Just purchased a 2005 Murano SL AWD and would like to know if using >>premium [quoted text clipped - 23 lines] > For what I paid for this vehicle, I'll pay the extra few cents to keep it > running strong. The computer detects through the use of sensors the octane range and adjust the performance accordingly. ie it retards the ignition timing. The dngine is designed to run on premium but the trade off isnt worth it. On these engines your mpg will decline and the the possibility of long term damage. How much did you pay for this vehicle the other option is to buy a vehicle that runs well on 97 octane. > If you want to squeeze the best fuel economy out of it, try to keep below > 2000 RPM in all driving conditions; whenever possible. [quoted text clipped - 32 lines] >> For what I paid for this vehicle, I'll pay the extra few cents to keep it >> running strong. Is this the same engine as the 2002 etc. 3.5 SE model Altima's? Should I be using high test too? What a difference driving this car rather than a puddle jumper. > The computer detects through the use of sensors the octane range and adjust > the performance accordingly. ie it retards the ignition timing. [quoted text clipped - 43 lines] > >> Chicago, Illinois, USA > >> 2005 Nissan Murano SL AWD I lease my 2003. I get a solid 19.7 mpg. What is the expected mpg for a Murano run-on premium? Love the transmission and engine and just about everything else on it. If you drive under 2K RPM, you will get up to 25.0 MPG on the highway. MPG Decreases sharply when the engine is running over 2000 RPM. The hardest thing to learn is to let the CVT vary the drive ratio at lower RPM than you are used to observing on the ptachometer of previous cars. Acceleration to highway speeds can be achieved at lower engine speed. However, stop and go driving requires higher RPM to get up to the lock-up speed for the torque converter (18-20 MPH). The calculations programmed into the fuel economy display are equally "weighted for time spent at idle (stopped in traffic) and time spent up to speed. For this reason, MPG shown on the display may not be accurate for drivers that spend the majority of their time in stop and go traffic. Also, the MPG and DTE figures will vary greatly after a reset (MPG) or near the bottom of the tank (DTE). >I lease my 2003. I get a solid 19.7 mpg. What is the expected mpg for a >Murano run-on premium? > > Love the transmission and engine and just about everything else on it. How much did you pay > Just purchased a 2005 Murano SL AWD and would like to know if using > premium grade gas is really necessary or will using regular be ok. Owner's > manual isn't very clear except to say that for best performance use high > test, won't be racing just city driving. Thanks |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.