Best engine flush / injectors cleaner for a 6-cylinder?
Best engine flush / injectors cleaner for a 6-cylinder?
Author
Discussion

Homer Jay

Original Poster:

167 posts

195 months

Sunday 8th October 2017
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Hi,

My E91 325 needs some tune up as it sounds badly so I am going to start by buying a good fuel system cleaner (oil and all filters will be changed soon, don't panic).

Any good brand rather than Wynns or Radex?

Thanks

bmwmike

8,789 posts

139 months

Monday 9th October 2017
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What engine

S2AVANT

217 posts

253 months

Monday 9th October 2017
quotequote all
STP fuel system cleaner

helix402

7,913 posts

213 months

Monday 9th October 2017
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It probably won’t fix your problem, but BMW sell a fuel system cleaner.

sparks_E39

12,738 posts

244 months

Monday 9th October 2017
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Every mechanic I've been to/know through work recommend against engine flushing. Be careful. Perhaps it just needs a decent service.

Homer Jay

Original Poster:

167 posts

195 months

Monday 9th October 2017
quotequote all
bmwmike said:
What engine
6-cylindres petrol
N52 or N53. One of those.

Homer Jay

Original Poster:

167 posts

195 months

Monday 9th October 2017
quotequote all
S2AVANT said:
STP fuel system cleaner
Thank you

Homer Jay

Original Poster:

167 posts

195 months

Monday 9th October 2017
quotequote all
helix402 said:
It probably won’t fix your problem, but BMW sell a fuel system cleaner.
True. Techron I think it is. Thanks.

Homer Jay

Original Poster:

167 posts

195 months

Monday 9th October 2017
quotequote all
sparks_E39 said:
Every mechanic I've been to/know through work recommend against engine flushing. Be careful. Perhaps it just needs a decent service.
I have read about this too. I don't know if I will do it, but I am definitely going for a fuel system cleaner.

Captain Answer

1,376 posts

218 months

Tuesday 10th October 2017
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Forte stuff is quite good but a bit harder to come by, can be found on eBay though

CarsOrBikes

1,158 posts

215 months

Tuesday 10th October 2017
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Protec

Forte also


Acidrop

165 posts

156 months

Wednesday 11th October 2017
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I've ordered some Techron. It's known as one of the best fuel system cleaners there is, plus BMW rebrands it as their own so it can't be too bad.

Tony427

2,873 posts

264 months

Wednesday 11th October 2017
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I did quite a bit of research looking into these fuel system/ injector cleaners and the active ingerients all seemed to be combinations of naptha, benzine, methanol, acetone, toluene, Xylene and a few others I forget, dissolved in a kerosene/parafin base with maybe a dye added for effect.

Where could I buy such chemicals I thought ? A bit more research shows that standard paint thinners or cheap gunwash available from automotive paint suppliers contained similar mixtures of solvents and active ingredients etc that are in the fuel line/ injector cleaners. But without being diluted into kerosene or with a dye. Its basically neat injector cleaner.

Thus for the last 6 or 7 years I have tended to dose a full fuel tank of my and various friends' petrol cars with 500 ml of thinners with no ill effects whatsoever. Given that such an additive would actually increase the octane rating of the fuel slightly we could have been getting more power in addition to a good cleaning as a result.

Before I tried this however, aware of the effects of methanol on rubber fuel components, I did submerge some fuel hose in 100% thinners for over a month and although the fuel hose did swell up when suspemded in the thinners, once removed it resumed its original form and performed just as expected holding pressure etc.

Given that I am diluting just 500ml of thinners into 50 litres of petrol and then using it in as normal/ or italian tune up prior to MOT, the danger of fuel system component damage is, I feel, minimal.

Sub £10 per gallon injector cleaner and more potent. Whats not to like?

Cheers,

Tony

Usual caveats apply..... dont try this at home, results may vary, keep away from children, investments may go up as well as down, ask your doctor, past results do not promise future performance, my advice is worth exactly what you paid for it etc etc








Andy70

1,463 posts

190 months

Wednesday 11th October 2017
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I invested 100 quid on a Terraclean service on my 110k e90, I recon it made all the difference so in theory my engine should be like new now, if it does what it says on the tin all carbon deposits should be cleaned off and injectors clean etc, I'm sure there are some oin here which will say its rubbish, but I recon it made all the difference