D4 Coolant Leak, No Visible leak or in Oil! HELP!

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Originally Posted by PerthDisco

That would be largely plastic.

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Aluminium, Cast etc. And yes. Plastic

There has been plenty of people suggesting that after market tanks and caps especially do not hold pressure. Mine often smelled of coolant until the genuine cap went back on.

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Originally Posted by josh.huber

There has been plenty of people suggesting that after market tanks and caps especially do not hold pressure. Mine often smelled of coolant until the genuine cap went back on.

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Yep. Only genuine.