Ummm.... Might want to go back and study your basic chemistry again.
is an ORGANIC acid, with the formula of C2
O. Organic acids are defined as having CARBON in them, which Acetic acid does have
. It is used in many commercial descaling forumlations, and is relatively benign, and very unlikely to dissolve cast iron.
Marsolve and Rydlyme, which you recommend both contain HCl, or Hydrochloric Acid in them. HCl is an inorganic acid, which you make such dire warning about. Which is it... don't use acetic acid or don't use inorganic acids... can't have it both ways.
Go ahead and drop a piece of iron into vinegar and see what happens, and then drop a similar piece of iron into Hydrochloric acid and see what happens.
BTW, the acid concentration of White Vinegar is only about 5% by volume, and that of Rydlyme or Marsolve is 10% by volume of a much more agressive acid. I seriously doubt that filling it with vinegar would do any significant damage to the block, even after 24 hours.
Keep the vinegar for your salads and out of the engine. Acetic (and most other inorganic acids) will attack the engine base metal .... use a proper boiler descaling compound that does not EAT the base metal of an engine. There is no such thing as a 'gentle' flush ... you either dissolve the calcium carbonate alone ...; or, the calcium carbonate with some of the cast iron.
Most A4s end their lives when corrosion bores through the sidewalls of the engine block casting .... the 'youngest' A4s are now approaching 30 years of age. Why would you want to shorten the remaining life that is left in an A4 by putting an acid through it? ....A4s dont wear out, they corrode away. Dont accelerate the 'ageing' by pouring acid into the engine !!!!! Use a proper commercial boiler descaling compound: Marsolve or Rydlyme.
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