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General E46 Forum
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Old 11-05-2010, 04:25 PM   #1
charlesrock
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What Fuel Injector cleaner is the best to use for 2003 bmw 325?

Hey guys,

I have searched the web but for some reason I cant find anything about fuel system cleaners...

my mechanic told me to use the SI-1 Complete Fuel System Cleaner, putting it in the gas tank when its on empty... and i remember my brother had an old 1988 audi and these cleaners messed his fuel filter.. is this the same for the e46 engine? Just wondering if its good to do, and what is the best cleaner possible for the motor?

Thanks guys!
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Old 11-05-2010, 04:28 PM   #2
dmax
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Techron has worked for me for years...add to empty tank when at the gas station and then fill up...don't run with it as fuel...if that's what you were advised.

Also, BMW fuel system cleaner 'with Techron Technology' if you want to spend more for what is almost undoubtedly exactly the same stuff...different label.

Anyway, three or four times a year I'll use it. If you never have, you might run two consecutive tank fulls with it added...or skip one tank and follow up with another in the third tank to ensure you're pretty clean...then just maintain every three months or so.

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Old 11-05-2010, 04:40 PM   #3
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^Oh hey Doug,
I've used Techron fuel system cleaner when the tank is 'almost' empty(12 miles left on OBC), I didn't get any good result so far..
Do I need to empty it almost completely then use it?
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Old 11-05-2010, 04:45 PM   #4
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I've heard BG 44K is the stuff to use if you want to clean your fuel system. I've never had to use it before myself so I can only relay what I've been told. You might want to try some and see if it works for you.
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Old 11-05-2010, 04:47 PM   #5
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Quote:
Originally Posted by mack89 View Post
^Oh hey Doug,
I've used Techron fuel system cleaner when the tank is 'almost' empty(12 miles left on OBC), I didn't get any good result so far..
Do I need to empty it almost completely then use it?
No, you add to tank before you fill it up...you don't drive with it as fuel, straight.

It's on the label...though in real fine print! I've added it when car is half full...even more...just top it off afterwards so it mixes in tank.

Also, you shouldn't let tank get down that low...according to fanatics bible, chapter 12, verse 3! I've heard mixed opinions of this...mostly from guys measuring their mileage by how far they can go on a tank!

Fuel not only lubricates fuel pump...it cools it...and there's also this issue, I've heard and believe, that the lower you go, the more likely you'll pull up gunk from bottom of tank...and if not slowly damage impeller in pump...clog fuel filter.

Me, whatever the truth...rarely let it get below 1/4 tank...and when I've done 250 miles...will fill up shortly thereafter. Rarely add more than 12.5 gals in a 17 gal. tank...so try to keep well clear of 'low.'

Anyway...think that's why you got bad results...it's not a fuel...it's an additive.

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Old 11-05-2010, 05:04 PM   #6
charlesrock
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Thanks guys! So where can I buy the techron chemical? im going to do this asap... but if its fine, I could also just use the one my mechanic told me to run SI-1 Complete Fuel System Cleaner no?
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Old 11-05-2010, 05:09 PM   #7
mack89
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^ Yeah I did add it, then fueled half tank.
I don't know why, but somehow my car gets horrible gas mileage when it's full tank.
When I had full tank, OBC showed 400ish miles, then I drove 15 miles, dropped to around 370ish. asdofjapsdofjpoadsjfposd Full tank didnt even last a week..That's why I always fuel 5 gallons. At least it lasts 3-4 days.
I never let it go below 1/8, but maybe that's why I'm getting trouble with fuel efficiency? uhhh...sdapfogjagpoafpomasfpadp
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Old 11-05-2010, 05:12 PM   #8
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Originally Posted by charlesrock View Post
Thanks guys! So where can I buy the techron chemical? im going to do this asap... but if its fine, I could also just use the one my mechanic told me to run SI-1 Complete Fuel System Cleaner no?
You can get it from Walmart or any other autopart stores..
And yes, Redline products are great as well. But I'd stick with Techron since BMW uses same product as 'BMW fuel system cleaner'. Just different label as Doug said so.
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Old 11-05-2010, 05:24 PM   #9
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Thanks guys.. I was so worried about using this type of stuff because of what my bro went through but i guess it will work out fine!
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Old 11-05-2010, 06:02 PM   #10
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I have had really good luck with techron as well. There have been posts in the past that have discussed the really aggressive fuel system cleaners, such as sea foam, and some have recommended that you add it shortly before an oil change as the deposits that it clears can get into the oil. There really seems to be just as many opinions on this topic as there are products, but Techron has worked out really well for me so far.
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Old 11-05-2010, 06:12 PM   #11
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I have had great results with Red Line S1, Techron would be my second choice. Techron is easier to find.
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Old 11-05-2010, 06:17 PM   #12
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Redline SL-1

THE RESULTS

http://www.redlineoil.com/content/fi...ech%20Info.pdf

THE PRODUCT

http://www.redlineoil.com/product.aspx?pid=80&pcid=12
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Old 11-05-2010, 06:21 PM   #13
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Should be noted that Techron bottle is to dose not more than 12 gallons. So take your tank to fuel warning light and add the difference to equal 12. This should provide the correct concentration.

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Old 11-05-2010, 07:21 PM   #14
mack89
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Hey BTW, what about this one?
http://69.161.220.35/index.asp?PageA...&ProdID=262243
lol seems better than using 15oz every few months without getting noticable results
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Old 11-05-2010, 08:54 PM   #15
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Buy the larger 20oz bottle of Techron, it treats up to 20 gallons, pour the whole bottle in and fill the tank.
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Old 11-05-2010, 08:59 PM   #16
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seafom in the vacuum system and in the fuel works great.
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Old 11-05-2010, 09:07 PM   #17
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I've used Techron for years ... many years ... in Volvo's, Porsche's, and now BMW's. I've been pleased with the results. Buy it at Autozone/Advanced Auto/etc. I use the 20 gallon bottle and dump it in, then fill it up, as DMAX said, and drive the piss out of it.
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Old 11-05-2010, 09:11 PM   #18
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Old 11-05-2010, 11:01 PM   #19
mp333
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BG Treatment at the dealer is worth the $150 which is done under air pressure by connecting to the fuel line. Worth it.
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Old 11-06-2010, 12:59 AM   #20
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techron also worked great for me. I also need more.
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