do i really need to run premium unleaded fuel?
#21
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...Hey don't feel bad, the question you asked is important, because for those of us who drive the Supercharged Jags, gas can be really expensive. So what if we use the mid grade, and every week throw in a STP to clean out the injectors? I don't see how this can harm the engine in anyway if you use the mid grade gas and use once a week STP ![Icon Shrug](https://www.jaguarforums.com/forum/images/smilies/icon_shrug.gif)
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#22
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If a heavy `spark knock' is detected even when using fuel of the recommended octane rating, or if you hear steady `spark knock' while holding a steady speed on level roads consult a Jaguar Retailer to have the problem corrected.
I read it to mean that if you use 91 or better and it still knocks, take it to the dealer, it's broken.
I read it to mean that if you use 91 or better and it still knocks, take it to the dealer, it's broken.
#23
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Last edited by jag79; 11-10-2010 at 05:53 PM.
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well i found out what was going on i made the mistake of not checking the air filter since service records show the oil and tires rotated religiously on the mark by a local shop. turns out the filter was from 06 and hadnt been replaced in 60k miles. now hopefully i wont be spending as much but, there still hasnt been a clear answer here. For people like me who dont drive far enough to get the engine really toasty is it possible that running mid grade would be safe and efficient in a s type v8.
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...Hey don't feel bad, the question you asked is important, because for those of us who drive the Supercharged Jags, gas can be really expensive. So what if we use the mid grade, and every week throw in a STP to clean out the injectors? I don't see how this can harm the engine in anyway if you use the mid grade gas and use once a week STP ![Icon Shrug](https://www.jaguarforums.com/forum/images/smilies/icon_shrug.gif)
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On occasion, I've seen dirty fuel injectors. It's usually on cars with well over 100,000 miles on them. Using a high quality fuel injector cleaner that's administered through the shraeder valve at the fuel rail is the only real way you might be able to clean deposits without a bench cleaning. A little STP won't do anything to injector build ups.
#33
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#34
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I'm not trying to put anybody down. Fuel injector cleaners, and other additives are marketed as the genuine deal. Unfortunately, there is no real way for the average car owner to objectively analyze benefits of using most additives. Lots of people just want to make sure they're taking good care of their car so they can do their best to avoid major break downs, if possible.
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
#35
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I'm not trying to put anybody down. Fuel injector cleaners, and other additives are marketed as the genuine deal. Unfortunately, there is no real way for the average car owner to objectively analyze benefits of using most additives. Lots of people just want to make sure they're taking good care of their car so they can do their best to avoid major break downs, if possible.
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
#36
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I'm not trying to put anybody down. Fuel injector cleaners, and other additives are marketed as the genuine deal. Unfortunately, there is no real way for the average car owner to objectively analyze benefits of using most additives. Lots of people just want to make sure they're taking good care of their car so they can do their best to avoid major break downs, if possible.
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
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Last edited by jag79; 11-11-2010 at 01:14 PM.
#37
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Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
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#38
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Looks like our brothers with X types enjoy going in circles too
https://www.jaguarforums.com/forum/s...ad.php?t=45374
https://www.jaguarforums.com/forum/s...ad.php?t=45374
#39
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Mikey, I was giving them the benefit of the doubt based on some online testing I found. Results of octane boosters will vary based on brand and the amount of fuel the booster is used to treat. In the testing done by Europeancarweb, the results were generally in the 1 octane range (10pts, lol)
http://www.europeancarweb.com/tech/0...ted/index.html
jag89 I'm skeptical any additive could make a significant impact to fuel economy. 15 gallons of fuel is 1,920oz. A 16oz fuel additive makes up only about 0.83% of the volume of fuel in the tank, and that's not enough to do anything to the hydrocarbon content of the fuel or improve the combustion efficiency for that matter. If the additive was able to break down carbon deposits on the spark plug or cylinder heads, it might improve valve seating which would improve compression and fuel efficiency.
That said, if you want to remove carbon deposits on an engine, warm the engine up, grab yourself a spray bottle of water, and spray a steady mist of water down the carburetor while the engine is running (I'm dead serious). The liquid water will turn into steam and remove carbon deposits on the inside of the engine. Spraying water is a heck of a lot cheaper than fuel treatment products, and it'll work better too.
http://www.europeancarweb.com/tech/0...ted/index.html
jag89 I'm skeptical any additive could make a significant impact to fuel economy. 15 gallons of fuel is 1,920oz. A 16oz fuel additive makes up only about 0.83% of the volume of fuel in the tank, and that's not enough to do anything to the hydrocarbon content of the fuel or improve the combustion efficiency for that matter. If the additive was able to break down carbon deposits on the spark plug or cylinder heads, it might improve valve seating which would improve compression and fuel efficiency.
That said, if you want to remove carbon deposits on an engine, warm the engine up, grab yourself a spray bottle of water, and spray a steady mist of water down the carburetor while the engine is running (I'm dead serious). The liquid water will turn into steam and remove carbon deposits on the inside of the engine. Spraying water is a heck of a lot cheaper than fuel treatment products, and it'll work better too.
#40
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I'm not trying to put anybody down. Fuel injector cleaners, and other additives are marketed as the genuine deal. Unfortunately, there is no real way for the average car owner to objectively analyze benefits of using most additives. Lots of people just want to make sure they're taking good care of their car so they can do their best to avoid major break downs, if possible.
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
Here in the Twin Cities of Minnesota, gas prices are as follows:
$2.70/gallon Regular
$2.80/gallon Super
$2.90/gallon Premium
Running super will save $0.10/gallon. STP Fuel Injector Cleaner = $6.00. You'll need to run through 60 gallons of fuel (1,200+ miles per week or 60,000 miles per year) just to break even... and that's if the method was valid, which it's obviously not.
Don't believe in the hype about octane boosters, either. At most you'll see a jump of 1-2 octane at a cost of $5.00, and you need to add that to every tank, lol. So while stepping up 1 grade costs you about 10 cents per gallon at the pump, it costs you 30 times more by using an "octane booster."
I just love the price of your fuel, think I'll move to the USA if you would have us that is
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For 1 ltr of 95 octane rated we are paying £1.15 to £1.19 which = £5.41 per Imperial gallon. Higher octane @98 rating is 4/5pence a litre more.
So from a UK perspective your fuel is dirt cheap. Shhhhhhhhh say no more. At the moment the exchange rate is £1.00 = $1.60 so gives you some idea on the cost of our fuel. I believe the US gallon is a little less than the imperial measure, so that should be taken into account.
Just to let you see how the other half live, or don't live come to that.
Regards,
Inver.
Last edited by InverStype; 11-11-2010 at 03:35 PM.