Discussion
Which precaution applies when removing plugs from an aluminium head?
Answer: D
Aluminium expands more than the steel plug, so a hot head grips harder and the thread can pull out. Penetrating fluid genuinely is used with care on seized plugs, which makes the last option a real if debated technique. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming what changes and what stays the same is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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