Hi .. I live in a small city in Thailand. The fuel here is not high quality and no brands so I am thinking of using the Techron concentrate plus every 2000 miles. Is it safe for my 911 50th Anniversary ?

Thanks

 

How many miles do you drive per year? What highest octane is available? Pure gas, or with ethanol? How much ethanol by %?

I suggest doing that treatment prior to your oil change, only.

 

Even here in the US there are places you can find yourself wondering about the gas. So when I go on long trips where that might happen I carry additives, although since my use is very occasional my focus is more on octane. Since your use will be frequent, maybe even long-term, it might be a good idea to search for more info. This Chevron web page for example says adding Concentrate Plus to a tank yields TEN TIMES the concentration of Techron in normal Chevron pump gas. http://www.techron.com/what-is-techr...-answers.aspx# So you would probably want to use 1/10th in every tank rather than 10X every few tanks. Then see if you can charm your Porsche dealer into having a tech look into diagnostics that might give you some indication of actual octane levels. Knock sensors for example will retard ignition and if they can spot a lot of this going on then you'll probably want to use octane booster as well. Of course its hard to believe you are their only customer with such concerns, so they will probably already know the answers to all your questions!

 

Hi ..because mine is imported from UK so no Porsche dealer to ask and to maintenance. No porsche dealer in my small city too...so I plan to do the maintenance on my neighbourhood car service. I order all maintenance kits from Online. When the time come needing to reset the computer maybe about 20000 miles , I will take my car to Bangkok or ask the technician to come down.

I mostly drive the car in the weekend morning for fun only and occasional drive to city (average only 25 mile/hour). I will drive about 6000 mile per year .. my friend said the fuel is 95 octane (but I think it must less than 95) but I am not sure whether it have ethanol ( no one know) .

I am a car fanatic and enjoy driving very much.....I also have a 958 Cayenne and BMW 528i (hate it cause the steering is too light) .

 

I plan to use the Techron cause My new 911 50th with the mileage of 1400 miles. When the engine either hot or cold (AC on or off) have an idling speed bounce range about 30 to 40 rpm (I can notice the rpm needle go up and down a little bit). Is it normal ? or problem with the fuel ?

 

I wouldn't put another additives such as Techron to your fuel if I were you. Porsche's engine isn't made for it (this is from personal experience) and especially God knows what strange mixture that your fuel in Thailand contains.

I suggest that you contact your local race tracks people (Bira Circuit or Thailand Circuit), I'm sure they know how to get you higher octane fuel or maybe F1 fuel (most likely at ridiculously high prices)!

Unstable idling isn't normal and most likely caused by bad fuel.

 

The 993's had good reason to use the Techron product, usually just prior to an oil change. I have 12 bottles sitting on a shelf of my garage. I won't be using any in my 991, but I suspect I will be having another 993 to keep the 991 company. The now deceased 911 guru, Bruce Anderson, was a great believer in Techron, but only for a specific purpose that does not pertain to the 991.

 

The 991 and the DFI engine is a great candidate for the benefits of Chevron Fuel System Cleaner with Techron.

 

I can probably get two 30L steel gas tank (your 991 has 64 liters tank) , fill it with 99.5 gasoline, and ship it straight to your door in Thai. Cost is around $165 excluding shipping. Shipping most likely will cost more than the gasoline itself LOL

 

Yes, Yes.... I have that as well. After a few computer re-flashes and a spacer installation on the cam position sensor it's less noticeable but it's still there especially in 7th gear (PDK).

 

LexVan....I don't know what you're referring to. What would Techron do to benefit a DFI engine? I ask in the spirit of...I learn new stuff every day.....Chris

 

Hey Chris! I follow the advice from several of the Porsche experts who work on, and see these cars in their daily life. Take 'em apart and put them back together. Guys like Kevin, Steve W., and Jake Raby here on Rennlist, and others like JPF on Renntech. They recommend a pre-oil change regiment of Cheveron Fuel System Cleaner with Techron. I've been following this recommendation for many years with air-cooled and water cooled Porsches. And now the newer/newest version of the DFI engine.

Here's one of their quotes:

"It does not take much to aggravate these injector systems, just a little build up of varnish or crud is enough to make the car respond. The newer DFI cars are even worse as the injector is in the combustion chamber."


Chris, re-read the last sentence. That's the key part for the 991 series. This is why I have already done this to my new car twice this year. Prior to each oil change (about the 1,200 mile mark and again at about 4,500 miles). I'll do again before winter hibernation in late September/early October.

YMMV. It works for me.

 

Thanks LexVan,

That makes a lot of sense. What I have is Chevron Techron 20 oz. in a black plastic bottle.
Under the word Techron it says "Gasoline and diesel fuel additive". It doesn't say "with Techron", it says it is Techron. The directions say to add one 20oz. bottle to no more than 20 gallons of gas. Run until near empty. Repeat dose if desired, but not more than five times between oil changes. Is this the same Chevron product that you are referring to? I used to dump a bottle in the last tankful prior to an oil change and I never had a problem.

The older cars that had little air ports in the combustion chamer would light up the CEL when the ports got clogged. Instead of removing the heads to fix, as many guys did, Bruce Anderson advised to run the car down to a few, maybe five gallons of gas and dump one, maybe two bottles I forget, and run the crap out of the car. It would smoke like hell, but it would often solve the problem. You immediately changed the oil. We used to have a Chevron station near here that the sign on the pumps touted "Contains Techron!". Now it is a huge store housing a cornucopia of junk food, a 50' long wall of various drinks and a tiny salad bar for credibility, I suppose. Outside are many gas pumps dispensing gas from an unknown source. Ah progress.....thanks for the advice.....Chris

 

Hate to be the one to ask a dumb question, but why is it important to wait til just prior to an oil change? Does it get into the oil enough to do anything negative?

There's no Chevrons around me so I've been using Shell. Pure-gas.org only has one small station anywhere near me that has 91 octane ethanol free gas so I assume Shell has that junk in it, as do most "tier one" stations. I'm assuming the amount is (hopefully) less than non tier ones. There's a pure-gas one about 4 hours away from me that has 110-112 octane. Hmmmmm.

 

Because Techron additive has a vapor and liquid deposition phase of operation and the portion that remains in liquid form or returns to liquid form can result in an increase in contamination of the oil.

Thus the recommendation to use Techron then afterwards change the oil.

Shell AFIAK does not add Techron to its fuel. It uses some kind of a nitrogen additive. I run 91 octane Shell (with "10%" ethanol) in both of my cars and it is a good fuel. The 91 doesn't seem have caused any problems over the years and miles.

Premium fuel is high detergent fuel but to really get the most from the detergents you need to drive the car. As I have experienced more times than I can count after an "extended" drive of 40 or more miles at highway speeds the engine really perks up. The transformation is sometimes quite remarkable. Even with the additive Techron in the fuel tank it works best if you really drive the car a distance. No need to get all crazy with the car, just try to arrange a route that can have you drive the car at say 65mph or whatever the limit is where you are and hold this for a span of miles.

The gasoline and its detergents, the Techron, will do the rest.