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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Redex dosageViews : 2598 Replies : 24Users Viewing This Thread : |
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Apr 6th, 2009, 16:32 | #1 |
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Redex dosage
Hi
I chucked a full bottle of Redex in my tank last time I filled up. I've since read somewhere that the correct dosage is one capful per gallon. If that's the case then my motor has OD'ed on the stuff. Will it do any harm? |
Apr 6th, 2009, 16:41 | #2 |
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ive od on the stuff many times never seems to have hurt it only when i used to shuff it down the carb on old cars smoked like a gooden
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'01 Silver V70 2.3 lt Pasted volvos '92 Silver 940se Turbo Easte 7 Seater 2.0lt BF200FT '94 Green 850 GLT 2.5lt 7 seater '97 850 CD T5 2.3lt full leather 7 Seater |
Apr 6th, 2009, 16:45 | #3 |
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What does the redex do? Does it clean the injectors, or de-coke the engine then?
I always thought it was just an octane booster, but i'm guessing not because all 740s/940s are ok on regular unleaded aren't they?
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1990 Volvo 760 GLE D24TIC ZF22 - 16psi, more fuel, Monark 293 nozzles, 40mm lower, Bilstein TCs, 24/19 ARBs, full Polybushed front, H&R spacers, 17" Titans. Running Veg oil/petrol mix. Past: 1988 Volvo 740 B230E M46, 1991 Volvo 940 B230FB M47 |
Apr 6th, 2009, 16:49 | #4 |
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it cleans the injectors (or carb back in the good old days)
u can use it the tank or down the plug holes (or at lest u used to be able to use it down the plug holes)
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'01 Silver V70 2.3 lt Pasted volvos '92 Silver 940se Turbo Easte 7 Seater 2.0lt BF200FT '94 Green 850 GLT 2.5lt 7 seater '97 850 CD T5 2.3lt full leather 7 Seater |
Apr 6th, 2009, 16:52 | #5 | |
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Quote:
I have two concerns about using too much though. Firstly my O2 sensor played up since I did it (a reset cleared the fault without having to do anything else, lets hope it stays that way). Secondly the afforesaid carbon deposits might be the only think holding the engine together after 166k+ miles. A situation from our local pub springs to mind, not about Redex but of filth holding stuff together. In several years of one landlord running the pub the beer lines were never cleaned. They gave the place up and their bar manager took over as tennant/landlord. The first thing he did once it was 'his ship' was clean the lines. On doing so several of the pipes sprung leaks at several points along them. Years of beer gunk were all that was holding the pipes together. In much the same way I'm worried that years of carbon deposits might be all that holds my engine together. |
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Apr 6th, 2009, 17:06 | #6 |
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If it was a rad or oil flush then yes i would say no as it will spring leaks but never had a redex prob evey time i get a new car i use the little white bottle and fill tank right up always seesm to make em move faster
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'01 Silver V70 2.3 lt Pasted volvos '92 Silver 940se Turbo Easte 7 Seater 2.0lt BF200FT '94 Green 850 GLT 2.5lt 7 seater '97 850 CD T5 2.3lt full leather 7 Seater |
Apr 6th, 2009, 17:11 | #7 |
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Thanks, thats reassuring. Its done a few miles since I put the Redex in and other than the possibly unrelated O2 sensor problem it seems fine so far. No noticeable improvement in engine performance or smooth running though, but then it wasn't bad to start with.
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Apr 7th, 2009, 12:46 | #8 |
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Looks like this thread is pretty well wrapped up, but just thought I would add that Redex is a brand name not a product, so it depends which redex product you bought.
They do make a product/products that i have used which is a fuel system cleaner... Advanced or somesuch? It comes in a gold box and costs around the £20 mark. That product you do chuck in the whole bottle, and it tells you only to do it once in a blue moon. The most common products though are the injector and fuel system cleaner which are a fair bit cheaper and come in red or green labled bottles (forget which is which), those I think you are supposed to chuck in a "shot" with every tank, hence why they now make the small one shot bottles. Hope that helps, must say though, ive never had any noticable difference after using any of the products I have tried on various cars, at least performance wise.
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Distant Past: 1988 745 GL B200E Past: 1993 945 S B200F Present: 1996 945 CD B230FT South West Volvo Group |
Apr 7th, 2009, 12:59 | #9 | |
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Quote:
Anyway, so far she is still running well, and has burnt off about quarter a tank since I did it. Fingers crossed she'll be fine, but just to be on the safe side I'll dilute it a bit by topping up the fuel at the weekend. |
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Apr 7th, 2009, 18:07 | #10 |
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Hi All,
Just another point of view on the subject of fuel additives. After 40+ years of motoring, I'm afraid I wouldn't touch any of them. Going back to the 1950's and 60's, Redex was originally marketed as an 'upper cylinder lubricant' and in this respect it had some merit - as an oil-based treatment flowing into the engine with the fuel it lubed the carburettor and inlet valves. But, even then, it did little more than that and reseach I read in the 1970's concluded that the clouds of exhaust smoke caused by injecting additive was purely and simply the additive burning off - no pre-existing deposits were shifted and the additive oil-base being burned probably added to the deposits already in the combustion chamber. The modern additives are supposed to flush any gum out of the injectors and cylinders, but I'm not aware of any recent research evidence that they actully work. Any deposits in the injectors etc must originate from contaminants in the fuel and simply shoving more oil-based additive through isn't going to have much effect and might even add to the contamination. Modern fuels are generally very clean (provided you buy the main named brands). I believe that, for keeping the engine clean, there is no substitute for using good quality fuel, regular and frequent oil changes using high quality oil, keeping the crankcase breather system clean, keeping the spark plugs in good condition and regularly changing the coolant - in other words, good maintenance. It also helps if the car gets a good motorway run at least every few weeks. As I understand it, putting any oil-based additive into the combustion chamber via the fuel is only ever going to produce more combustion products - ie, carbon gum. Fuel and oil additives for cars are a bit like vitamin supplements for people - they are expensive and are good business for the manufacturers, but there is little evidence that they do any good and they might even do more harm than good. Stan. |
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