bengal taiga
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There are many alternatives. Prices vary. No particular favorites. Rarely have need for fuel additives.
which petrol additive do you use ?
- Thread starter deQuincey
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There are many alternatives. Prices vary. No particular favorites. Rarely have need for fuel additives.
coupe2800cs
Well-Known Member
Lucas Fuel Additive
I use this few times a year all my cars, recent tear down on my wife's T100 Toyota V6 for head gaskets showed no intake deposits, though there was some light varnish, no heavy deposit like the pictures on the bottle of Chevron Techron additive.... Otherwise gallon of Toluene can be purchased at hardware store for relatively cheap to make some high octane stuff...
http://www.elektro.com/~audi/audi/toluene.htm
I use this few times a year all my cars, recent tear down on my wife's T100 Toyota V6 for head gaskets showed no intake deposits, though there was some light varnish, no heavy deposit like the pictures on the bottle of Chevron Techron additive.... Otherwise gallon of Toluene can be purchased at hardware store for relatively cheap to make some high octane stuff...
http://www.elektro.com/~audi/audi/toluene.htm
point 5 of the document may have aged not so well,
"BMW does not recommend exchanging only the valve seat rings on engines from the affected manufacturing period for the "hardened" version, as the required assembly tools are in the main not available and because there is no real cost saving compared to fitting an original BMW cylinder head. "
...go and find one ;-)
Philippe db
Well-Known Member
Never used any additives and only use 98 octane fuel. As far as I'm aware of the M30 was one of the first engines capable of running on lead free petrol.
Regarding additives. In my cars, I use Lubri Moly 'Ventil Sauber' occasionally to keep the back side of the valves clean, and their 'Jectron' as a fuel injector cleaner. The Audi A8 is a direct injection engine, and has a tendency to need the injector cleaner (partially because my wife drives it most of the time, and she is very conservative in allowing RPM's for the engine!!). Both are German products and I've found they do the job well in German cars.
Gary
Gary
Aluminium heads have hardened valve seats already so the need for leaded fuel is a bit of a fallacy imo. As long as the octane rating of the fuel is the minimum the car needs there should be no lead substitute needed for an aluminium head engine.
be careful, the prior document, an old friend, says the contrary, earlier heads are usually shot, but if you have a head younger than 82 you mus t be careful
not all of them
Whoa... dragging a thread from the Way-Back Machine.
Techron for cleaning fuel systems. Excellent product.
Marvels Mystery Oil. A few ounces in every other fill up for carbureted engines helps keep the alcohol from degrading seals and such. Helps clean upper cylinders, as well.
Ed Z
Techron for cleaning fuel systems. Excellent product.
Marvels Mystery Oil. A few ounces in every other fill up for carbureted engines helps keep the alcohol from degrading seals and such. Helps clean upper cylinders, as well.
Ed Z
From the above PDF:
Manufacturing period: start of series up to and including August 1984
Procedure:
1. The engines listed above can be run on unleaded fuel without problems occurring, provided that they have covered a distance of at least 60,000 km (approx. 40,000 miles). In such cases, so much lead and lead tetraethyl is diffused into the material of the valve seat rings through the past frequent refuelling with leaded fuel that the required protective effect will be present for the remaining service life (memory effect).
2. If the service life is less than 60,000 km (approx. 40,000 miles) and the driving style is sporty (high engine speeds, etc.), it is advisable to add an appropriate "valve protection additive" to the fuel when refuelling with unleaded fuel. These additives are available from most filling stations or from renowned additive manufacturers. The additive manufacturer's directions and notes on possible risks should be carefully observed.
In other words, old engines w/miles most likely had SOME leaded fuel put in, so it has the so-called "memory effect."
If your old M30 has low miles and known for a fact, unleaded was used extensively, then it's good to have an additive so it can build up a "memory."
Manufacturing period: start of series up to and including August 1984
Procedure:
1. The engines listed above can be run on unleaded fuel without problems occurring, provided that they have covered a distance of at least 60,000 km (approx. 40,000 miles). In such cases, so much lead and lead tetraethyl is diffused into the material of the valve seat rings through the past frequent refuelling with leaded fuel that the required protective effect will be present for the remaining service life (memory effect).
2. If the service life is less than 60,000 km (approx. 40,000 miles) and the driving style is sporty (high engine speeds, etc.), it is advisable to add an appropriate "valve protection additive" to the fuel when refuelling with unleaded fuel. These additives are available from most filling stations or from renowned additive manufacturers. The additive manufacturer's directions and notes on possible risks should be carefully observed.
In other words, old engines w/miles most likely had SOME leaded fuel put in, so it has the so-called "memory effect."
If your old M30 has low miles and known for a fact, unleaded was used extensively, then it's good to have an additive so it can build up a "memory."