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> Gasoline - 90 Octane, Ethanol Free (89), or additives, How to reduce valve knock
post Feb 6 2019, 07:46 AM
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Group: Members
Posts: 180
Joined: 31-December 12
From: Concord, NC
Member No.: 15,313
Region Association: South East States

We are having some Spring weather this week in Charlotte, NC (and no rain!) so I've been driving the 914 and noticed that after about 20 minutes of driving, the valves intermittently knock from "normal" to very loud for no apparent rhyme or reason.

Outside of the obvious that it may be time for a valve adjustment, I wondered what Gasoline grade folks are using.

What Petro are you using in your 914?
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