Discussion
Which fault does a blocked crankcase ventilation valve produce?
Answer: A
Blow-by with nowhere to go pressurises the crankcase and pushes oil past every seal. The last option describes exactly that consequence, which makes it a correct and more vivid version of the same answer. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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