Read it carefully

Question

My prefix is found in an automobile,
My infix corrects a mistake with mistakes,
My suffix is practice if you're very old.
My whole may be found unexpectedly.

Hint:

My infix is not spelled correctly.

Answer 1

My prefix is found in an automobile

liter - as in units of gasoline. US usage as also in automobile, though gallons would be used.

My infix corrects a mistake with mistakes

eratu - an erratum corrects a mistake and there are two spelling mistakes. Also by the hint.

My suffix is practice if you're very old

ure - an old word for practice

My whole may be found unexpectedly

literature - it is the last word, as a tag, in the riddle.

Title: Read it carefully

literature is read, and carefully as the word appears attached to the question

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Second washed-up attempt: My prefix is found in an automobile

water - added to battery acid, radiator coolant and windscreen washer detergent.

My infix corrects a mistake with mistakes

erf - applied to a single measurement (not exact - a mistake) of a normal distribution, gives a range and a probability it lies in range, so corrects a mistake to two mistakes, using mistakes.

My suffix is practice if you're very old.

fall - practice meaning to do often, and old age increases the risk of falling.

My whole may be found unexpectedly.

waterfall- famous ones, such as the Angel Falls, were rediscovered unexpectedly by foreigners.

_{No explanation of the title or the literature tag, so no high hopes, though the question may get other responses, or a hint.}

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First failed try: My prefix is found in an automobile,

rev - a turn of the engine

My infix corrects a mistake with mistakes,

revoc - cover up, efforts to fix a mistake, leading to a litany of mistakes

My suffix is practice if you're very old.

vocation - one's life's work, practice being your work

My whole may be found unexpectedly.

revocation - cancellation or calling off something, usually unplanned

Read it carefully

literature tag - :)

I think this answer will be annulled by Rand.

Answer 2

Prefix=Auto ->(auto)mobile infix= S -> Mistake(s) suffix= -> MD (old practice was Medicine from MD) whole=found (maybe :)

Autofoundsmd