I would like to see the actual TSB that recommends using additives every 3k. If that's the case, then there's definitely a design flaw in BMW engines since no other manufacturers have this recommendation. It's a catch22 when using fuel additives. While it's great for fuel injectors and intake valves, the concentrated additives isn't good for alot of the other components in the fuel system.

yes of course, i respect your opinion and all the things you said makes sense. I was just saying that it's been my practice, although i have never encourage anybody to do it. It might be or not be because of it that my bimmers last long without any problems, but it's just me. But i have deep respect for you sir :thumbup:

This is a very good debate, but I go back to my original post - I have 81K miles on my X5, never poured anything like that into my tank. The car runs fine, so should I start dumping that stuff in once in a while? :popcorn:

yes.

I never heard of some of those companies; and I'm surprised not to see Exxon Mobile on there.

I purchased my 2004 X5 used in 2006. Whenever I got stuck in bumper to bumper traffic on the freeway my X would jerk like it was going to stall. The only way to stop it was to give it a little extra gas. I took it to the dealership and they told me my engine needed to be decarbon because of build up. It cost $170 to get the decarbon. Afterwards the mechanic told me to only use Chevron gas and to put a bottle of the fuel cleaner in about every 3000 miles.

Well since 2006 I have only added the fuel cleaner twice and my car is running fine. I think every 3000 miles is too aggressive since I am using Chevron gas which includes small amounts of Techron anyway. So maybe once or twice a year for me.

Decarboned?

What did they do for <$200 to "decarbon" it?

I don't recall the exact steps but I think the mechanic said something about doing a pressurized flush on the engine (but don't quote me on that as its been 2 years since I had the conversation with him).

I did keep the receipt. Here is what it says:

Installed 82 14 0 413 341 :FUEL SYSTEM CLEANER [email protected]
ENGINE DECARBON COMPLETE
Labor: 137.95 Parts: 32.00 Total: 169.95

Based on the receipt it looks like they charged me 137.95 to add two bottles of cleaner!

THis is funny because Porsches recommended fuel additive is Techron

I use a fuel system cleaner every few thousand miles. I use to use Redline, but I cannot find it in stores anymore. My question is, can you use the techron with Shell gas, or is it better to use it with Chevron?