: I read a post about top tier gasoline....



limoguy
10-23-07, 11:37 AM
....does using top tier gas mean I can easily run 87 octane in my 98 deville? I havent tryyed it but I wanted to get some feedback on it. Where I live I do have shell stations, some Chevron`s but thats it from the top tier list. thanks.

Submariner409
10-23-07, 12:29 PM
There's a year crossover for recommended N* octane requirements. The N* PCM "listens" to a pretty sensitive knock sensor, so you would probably be OK with 87 for normal driving, but not towing or extended mountain climbing.

Do a google for "top tier, techron, gasoline". Settle in for a long session.

limoguy
10-23-07, 12:35 PM
:Dthanks submariner..im going to try shell 87 in a few days.today is 6 cents off premium day..so she gets filled with bp ultimate!

Submariner409
10-23-07, 12:46 PM
Just as an aside, the google reads on top tier fuels will make specific mention of Chevron's TECHRON additive, which is now licensed to a lot of national and local fuel blenders. (BP is recommended by Ford, but is not a top tier fuel...)

AutoBarn, in your area, sells 20 oz. bottles of TECHRON for around $8. Quite expensive for a one-time shot, but that's all that's recommended every 3-4,000 miles. West Marine also sells the stuff. It's magic in a marine engine.

limoguy
10-23-07, 12:54 PM
Yes, I know BP is not top tier but its 6 cents off umitimate today. As far as top tier stations are concerned, I went to the top tier web page, they list shell & chevron...Those are the only two in my area. I will definitely try shell probably in a couple days. thanks:lildevil:

dkozloski
10-23-07, 01:32 PM
BP+Chevron Techron=Top Tier. The base stocks of all common brand name gasolines come from the same refineries, are the same, and they all contain a small amount of system cleaners by EPA regulation. Top Tier gasolines contain additional system cleaners above and beyond that required by regulation. Add the cleaners to the cheaper gas yourself.

eldorado1
10-23-07, 02:48 PM
Don't run 87 octane. Your car will thank you for it.

fubar569
10-23-07, 04:49 PM
Don't run 87 octane. Your car will thank you for it.

the difference is about 4-6 dollars a tank at most...

if you buy a bottle of "additive" to add to your 87 you should have just hit the button for 93 while you were at the pump because you just paid more...

I run exclusively 93 octane in mine unless i am bottom of the barrel broke in which case i cut out a mcdonalds meal and still fill with 93...or i slip in about 5-10 bucks of 87 to carry me to my bi-weekly paycheck so i can grab a bottle of techron and refill with 93...

coincidentally i have no fuel system or performance issues...

i also notice a difference between running on 87 and 93...a little with the 93+tech mix but not so much...

Submariner409
10-23-07, 06:09 PM
fubar,

TECHRON is not any form of an octane booster or all-purpose fuel system additive. It is an engine deposit cleaner blended into some gasolines, in microscopic amounts - parts per million.

The 20 oz. bottle says to use that much of a slug only once every several thousand miles.

Google the "top tier" sites and figure out what the stuff really is.

It is NOT "104+" - not even close.

limoguy
10-23-07, 06:17 PM
:annoyed:I doubt if I add that techron stuff. I may mix premium with 87 or 89 and see how she runs with it. I doubt if I run straight 87, obviously the car is intended to use at least 91 octane .

fubar569
10-23-07, 06:57 PM
fubar,

TECHRON is not any form of an octane booster or all-purpose fuel system additive. It is an engine deposit cleaner blended into some gasolines, in microscopic amounts - parts per million.

The 20 oz. bottle says to use that much of a slug only once every several thousand miles.

Google the "top tier" sites and figure out what the stuff really is.

It is NOT "104+" - not even close.

this much i know...but thanks for restating the obvious...

i have been using it recently to help clean out 110k miles of gunk...2 bottles in the first tank (cause it only treats 12 gallons, caddy is 18+) and 1 bottle in each of the 3 sucessive tanks...then im done...

even if i were looking for an octane booster...i don't think "104+" even is as powerful as it used to be...i wouldnt even bother. if i were serious abotu needing anything mroe than 93 i'd buy a 55gal drum of 110 and blend my own...

eldorado1
10-23-07, 07:47 PM
octane boosters don't work... They state on the bottle +5 points octane or some such.... What they don't tell you is one point = 0.1 octane

So dumping a bottle in a tank of 87 will give you 87.5 octane

I highly recommend top tier fuels, or at least using techron or one of the other additives... They do work, and there are tests out there that prove it.

limoguy
10-23-07, 08:18 PM
I hear ya..its all about marketing to sell that stuff

Ranger
10-23-07, 11:03 PM
You can run ANY brand of 87. Do a search for "Octane" and settle in for a lot of reading.

eldorado1
10-23-07, 11:40 PM
You can run ANY brand of 87. Do a search for "Octane" and settle in for a lot of reading.


You can, but you shouldn't.

The knock sensor will pick it up before engine damage occurs (if it's working), but it was designed to use 91.

It's the price of admission. If you don't like it, buy a honda that sounds like a weed eater.

Ranger
10-24-07, 12:10 AM
Damage? What damage? I ran my '97 on 87 on the advice of the Guru for 3 years before selling it at 107K 2 years ago. My neighbor is still driving it. You WILL NOT do any damage by running 87. I would never tell anyone to do that if it were possible to damage the engine.

eldorado1
10-24-07, 12:19 PM
No damage.

You will have less HP and probably less MPG.

Ranger
10-24-07, 01:00 PM
Theoretically that should be true. FWIW, when I switched, I noticed no change in mileage. Seat of the pants dyno detected no change , though admittedly there should be some if it was accurately measured on a dyno.

limoguy
10-24-07, 02:43 PM
:bouncy:Im gonna try 87, im curious to see if it goes ok. I dont do any WOT or really fast driving anyway. thanks

Ranger
10-24-07, 06:14 PM
You can still go WOT and probably won't notice the difference. Try it and you be the judge. Won't do any harm and you can always switch back. Let us know what you think.

limoguy
10-24-07, 09:09 PM
OK..I put 87 from BP today. So far, theres no noticeable difference. there was about 4 gallons in the tank of 93 still though. I will get more 87 next fill.

krimson_cardnal
10-25-07, 03:53 PM
Right on Binkey!! I'm believing that engine deposits have been grossly ignored, at least there's been little coordination between the fuel producer guys and the engine building guys. Cleaner engines run cleaner. K_C


BP+Chevron Techron=Top Tier. The base stocks of all common brand name gasolines come from the same refineries, are the same, and they all contain a small amount of system cleaners by EPA regulation. Top Tier gasolines contain additional system cleaners above and beyond that required by regulation. Add the cleaners to the cheaper gas yourself.