[QUOTE]Originally posted by honda606
Thanks for the replies so far.

Road Rage...so if you call Redline direct they will have a product called SI-2?

The only thing I can find on their website is the SI-1.

 

Having taken down a number of engines I can see absolutely no benefit in this. The strainer, filter, and injector strainers will block anything in the fuel "system" prior to the injectors. Carbon removal sounds like a good idea until you realize that even at 200k miles you should not see excess carbon buildup at the injectors unless something has gone wrong (failure to maintain fuel metering, etc.). Unless you are running stupid rich you should not have carbon buildup substantial enough to impede airflow or proper combustion.

A lot of people will report higher mileage on higher-performance vehicles after use of cleaners, not realizing that the cleaners will often temporarily increase their effective octane number which will improve mileage in a high-CR vehicle like the S. This effect, like with an octane booster, usually comes at the expense of the life of the O2 sensors and the cat.

 

I can get RL SI-1 & SI-2. If there is interest for it I can stock it in the store.

PM me if you want it and I'll get a price.

-Ry

 

[QUOTE]Originally posted by marcucci
Having taken down a number of engines I can see absolutely no benefit in this. The strainer, filter, and injector strainers will block anything in the fuel "system" prior to the injectors. Carbon removal sounds like a good idea until you realize that even at 200k miles you should not see excess carbon buildup at the injectors unless something has gone wrong (failure to maintain fuel metering, etc.). Unless you are running stupid rich you should not have carbon buildup substantial enough to impede airflow or proper combustion.

 

[QUOTE]Originally posted by honda606
Thanks for the replies so far.

Road Rage...so if you call Redline direct they will have a product called SI-2?

The only thing I can find on their website is the SI-1.

 

[QUOTE]Originally posted by Road Rage

 

A thoughtful response deserves a thoughtful answer:

It depends - note that the citation above is dated 1998 - so apparently an air resources board somewhere felt that the problem was still there. Here is background:
http://www.chevron.com/prodserv/nafl/docs/LTB_39.pdf

Most teardowns are of well maintained cars - little contaminated oil blowing back into the intake tract, and quality fuel used. But detergent levels have dropped since the 1980's, according to my industry sources, as the search for low-cost provider drives into the profit column. The gas companies have taken the position that the higher precision metering of modern injectors (and their no-clog designs) has improved things. Perhaps it has.

But some folks may let their oil get a bit soggy, or pick up a bad batch of gas, or catch a gas at the seasonal change over, or the winter super-oxygenated blends. There are any number of situations where deposits could form.

Again, I refer you to Chevron's own literature citing "intake valve deposits from competitor's gasoline after 10k" pics.
http://www.chevron.com/prodserv/nafl/auto/...nt/fueladd.shtm
Personally, I just throw a bottle in and forget about it - plus, Red Line has a top cylinder lubricant as I recall.

 

Are you not aware that it is a common practice in most industries to continually test until you get the results you need for marketing data?!

Continue to use the stuff, it is good for the economy. I'm merely sharing my practical experience that no well-maintained engine (read: not running too rich or consuming oil) needs any kind of fuel system cleaner. It generally just goes right out the tailpipe, leaving deposts on the O2 sensor and overheating the cat as they go...

 

[QUOTE]Originally posted by marcucci
Are you not aware that it is a common practice in most industries to continually test until you get the results you need for marketing data?!

 

haha, sorry to bring this post back, but road rage is the man! Dropping the knowledge every time