Macster

Techron works in DFI engines. Techron as a liquid and vapor phase. When fuel with Techron is injected into the engine any thing the Techron as a liquid comes in contact with -- including the injector nozzles -- is cleaned. During combustion the Techron turns to vapor. Since some exhaust gas can flow back and contact the intake valve the intake valve being "cold" causes any vaporized Techron to condense on it and then liquid (again) Techron can loosen/remove deposits on the valves.

If you want to run Techron periodically my advice would be to run it a tank or two *before* an oil change. I would use Techron according to directions. Well, I cheat a bit. A bottle I buy treats 20 gallons but I use the entire bottle even though the gas tanks of both of my cars only hold a bit over 16 gallons.

Unless the bottle of Techron is sized to treat just 4 or 5 gallons of gasoline I would *not* use a bottle of Techron that treats 20 gallons or whatever in just 4 or 5 gallons of gasoline.

Just use Techron according to directions and it will work just fine.

Petza914

One bottle with the last full tank before an oil change following the Techron to fuel ratio on the bottle

SoCal C2S

Just before an oil change....like 400 miles. I’ll do a trip to Paso where it’s a tank up and a tank back both with a bottle of Techron. I do use Chevron 98% of the time as well.

BER

I do the same as many other Rennlisters...I add a 20 oz. bottle about a month before an oil change. Solids that the Techron cleans from the engine are either incinerated during combustion or picked up by the detergents in the oil. When the oil is drained, the "crap" is removed from my engine.

I change oil every 6 months, so I do two applications of Techron each year. My engine should "sparkle"!

ADias

Which additive package is in Costco gas? Techron, Shell Nitro, or what? And is it the same in all Costco gas stations across the country?

alexb76

Maybe for you, but simply due to the technology it WILL HAPPEN, it's a fact of life with Direct Injection hence the new dual systems and valve cleaning systems put in place in the newer Audi and Toyota cars. Porsche design is better than VW, so it won't happen as quickly or severely, but since Valves don't get fuel detergent on em, will develop deposit sooner or later.

Wayne Smith

And still we continue to wait for the first actual case of carbon build up on a 9A1 motor, even after millions of miles and many cars with over 100K miles. I'd say that Porsche's engineers did a pretty good job 8)

808Bill

Oh hell no! I'll never use COSTCO gas again...

voiceprint1

any thoughts on how Techron might affect your cars idle?

Petza914

I've never noticed an idle difference on or after my last tank before an oil change, which is when I run the Techron

LexVan

None. It won't.

Ericson38

Bruce in Philly has spark plugs of non-uniform color. Could be because one injector (direct injection type in his 997.2) is slightly leaking and fuel trim for that bank will lean the others out as a group to keep A/F in range.

Jake at Flat Six has 997.1 engines are being damaged by injectors that are not sealing when off (dribble) that wash the oil off the cylinder walls and increase the chances of bore scoring.

I have a VW camper (1990) that has 221K miles and original injectors and engine. Steel liners. So no problem there, much less side loading of skirts along bore.

Back to Porsches....I use fuel injector cleaner in ours all the time (every 3rd tank full). Have been doing that since we bought it 3 years ago. This includes Marvel Mystery oil and Sea Foam.

Ericson38

Mac,

There is little to no exhaust gas headed up the intake port to clean the back of the intake valve. During the overlap, inertia of the exhaust gas still exiting the chamber is starting to draw fresh air though the intake port as the intake begins opening before TDC some number of degrees. Also, by the time this is occurring, the combustion is fairly complete and there is no solvent left to clean the back of the intake valve.

Wayne Smith

FWIW ... per Porsche.

LexVan

Thanks for reposting this picture. That's always been my understanding, that the back side of the valve gets "washed".