[Tag]

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A 4 stroke engine has cylinders with pistons in them and oil beneath the pistons in the pan. The four cycles of combustion are as follows. During the first cycle INTAKE, the piston moves downward and pulls in the air/fuel mixture. During the COMPRESSION cycle the piston moves upward and squeezes the mixture for a bigger bang. Pistons are not airtight, they are sealed against the cylinder walls by overlapping piston rings on the head of the piston itself but still some air/fuel gets past them and into the oil pan which is beneath. Then on the POWER cycle when the piston reaches full compression it's ignited via spark, again this pushes more gasses and exhaust to blow past the piston rings into the oil below. Finally you have the EXHAUST cycle which opens up the exhaust valves and as the piston moves up upward it helps expel the burnt air/fuel.

Fuel cleaners break down carbon buildup etc. which gets into the oil. They also are so strong that it breaks down the oil as well when it gets into. Hence, change the oil after using any fuel system cleaner.

[MatchesMalone]

Originally Posted by tag824

^

Not sure if you were being sarcastic by breaking it down to such a basic level, but either way I appreciate the explanation. I also didn't know that they can also break down the oil. Good to know, thanks!

On a side note, I prefer to refer to the 4 cycles as follows: Suck, Squeeze, Bang, and Blow

[joegeeZe]

Originally Posted by MatchesMalone

I've seen lots of people on here say that after running through a bottle of the stuff, it can liberate deposits of built up gunk/sludge. However, I don't fully understand how any significant amount would get from the fuel system into the oil. Personally, I've always done it to be safe.

Isnt it necessary to change the oil ONLY if you use the concentrated kind? There are two versions of the chevron with techron, one is concentrated which calls for oil change and the other is maintenance only and should be used about 7500 miles or so.

Am I wrong?

[klove83]

Good info thanks

[tntsE90]

Originally Posted by joegeeZe

Is this the best way to do it? Or should I change the oil first, fill up on gas, go and buy the cleaner and pour it in after the purchase?

Thanks guys.

Actually, make sure you buy the CHEVRON FUEL SYSTEM CLEANER:

http://www.chevron.com/products/prod...tives/tcp.aspx

The one people are talking about here is just the fuel injector cleaner. It's $6.99 at Walmart or your local auto part store and you DO NOT, REPEAT DO NOT need to change oil prior to using the fuel system cleaner. Whoever told you to change your oil prior to using the cleaner is just plain .

You pull the bottle into the gas tank when you are on LOW fuel and then fill up on gas.

[MatchesMalone]

Originally Posted by tntsE90

... and you DO NOT, REPEAT DO NOT need to change oil prior to using the fuel system cleaner. Whoever told you to change your oil prior to using the cleaner is just plain .

Well fortunately, nobody is saying to change the oil prior to using it.

[tntsE90]

Originally Posted by MatchesMalone

prior to using it.

I read post #2 wrong, never heard or saw a Chevron Techron product that required a oil change before or after use. Good job pointing it out.

[orionredwing]

I love Chevron Techron and have been using it for years.

But in a few threads over the years, something about fuel system cleaners not recommended for direct injection engines, because of possible clogging of the piezo injectors?

Direct injection is new to recent generation of cars, so I'm sure ubsubstantiated rumors abound aplenty. Yet because it's so new, not sure if we understand it completely. So despite using it for many years, I've been keeping my Techron bottles in storage.

I fill up with Chevron anyways, so I'm still getting it in my gas anyways

[F32Fleet]

Originally Posted by orionredwing

I love Chevron Techron and have been using it for years.

But in a few threads over the years, something about fuel system cleaners not recommended for direct injection engines, because of possible clogging of the piezo injectors?

Direct injection is new to recent generation of cars, so I'm sure ubsubstantiated rumors abound aplenty. Yet because it's so new, not sure if we understand it completely. So despite using it for many years, I've been keeping my Techron bottles in storage.

I fill up with Chevron anyways, so I'm still getting it in my gas anyways

Never heard of that, but I have heard that overuse of these types of cleaners may cause injectors (DI or port) to eventually leak.

[Chriztofor]

Originally Posted by VTECaddict

Pour it in at the gas station right before you fill up. Then change oil after you burn through the new tank of gas.

You do not have to change the oil http://www.e90post.com/forums/showthread.php?t=492475

[virk007]

I have never used a Fuel System Cleaner before, I have 07 e90 328i and about 700 miles left before my oil change, thinking about making an appointment for Friday, my tank is about 3/4 should I wait until it hits 1/4 then add it and fill up gas or is it okay to do it at 3/4. Reading on the forums, it seems like chevron techron is the best. Do we need the 12 oz or 20 oz bottle. ?

[bulldog_yyc]

Originally Posted by virk007

I have never used a Fuel System Cleaner before, I have 07 e90 328i and about 700 miles left before my oil change, thinking about making an appointment for Friday, my tank is about 3/4 should I wait until it hits 1/4 then add it and fill up gas or is it okay to do it at 3/4. Reading on the forums, it seems like chevron techron is the best. Do we need the 12 oz or 20 oz bottle. ?

if you are close to JRP (mississauga), grab some redline S1 cleaner its about $10/bottle and works well

[virk007]

I'm currently in the states, so was thinking of using chevron techron but not sure of what size bottle to use.

[virk007]

Advance Auto Parts currently has a sale online; Buy 1 and get 1 Free Chevron Techron Fuel System Cleaner 12 oz. Ordered 2 for $8 online

[AcExSpades]

Originally Posted by virk007

I'm currently in the states, so was thinking of using chevron techron but not sure of what size bottle to use.

This. How much is it recommended?

[BTTGMan]

Originally Posted by orionredwing

I love Chevron Techron and have been using it for years.

But in a few threads over the years, something about fuel system cleaners not recommended for direct injection engines, because of possible clogging of the piezo injectors?

Direct injection is new to recent generation of cars, so I'm sure ubsubstantiated rumors abound aplenty. Yet because it's so new, not sure if we understand it completely. So despite using it for many years, I've been keeping my Techron bottles in storage.

I fill up with Chevron anyways, so I'm still getting it in my gas anyways

I've heard this too, including from my sales guy who was adamant that the injector cleaners aren't designed for piezo injectors, and all you old possible do is screw them up. Of course this is only relevant if you have them.

[mweisdorfer]

Try grease lighting fuel injector cleaner. It is good for 12k.

[Gate7]

Originally Posted by BTTGMan

I've heard this too, including from my sales guy who was adamant that the injector cleaners aren't designed for piezo injectors, and all you old possible do is screw them up. Of course this is only relevant if you have them.

Anyone with n55 engine had issues with chevron cleaners?

[tntsE90]

Originally Posted by Gate7

Anyone with n55 engine had issues with chevron cleaners?

BMW sells the exact same stuff as the techron fuel system cleaner. The bottle even looks the same! Only difference is the BMW sticker.

[/img]http://www.xoutpost.com/attachments/x5-e53-forum/22810d1204348594-bmw-fuel-system-cleaner-techron-bmwtechron.jpg[/img]

[Gate7]

Originally Posted by tntsE90

BMW sells the exact same stuff as the techron fuel system cleaner. The bottle even looks the same! Only difference is the BMW sticker.

[/img]http://www.xoutpost.com/attachments/x5-e53-forum/22810d1204348594-bmw-fuel-system-cleaner-techron-bmwtechron.jpg[/img]

I meant more of the fact, does it work well with new injectors n55 engine uses?

[tntsE90]

I am pretty sure if the stuff did any harm to injectors or the engine, BMW would had pulled it or at least put some kind of warning label on it.

[///M3NACE]

This is harmless and does work. I actually put seafoam all in my dads quarter million X5. At first I was like I probably wont notice anything but after like half way through the tank it become very noticeable. Acceleration was a lot smoother and just drove better. My dad noticed it right away as well and asked if I did any maintenance on it. He went out of town and I was driving it in the mean time.

I did it on my e90 and won't notice anything. I always put good gas and it was low miles. I put it every 10k on my e90 and every 5-10k on my dads X5. I usually just buy it when its buy 1 get 1 and use it every year.