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Discussion Starter · #1 ·
When I accelerate hard or climb a hill I hear this clicking in the engine.

Anyone know what is the cause of that? is it have to do with grade of gas as
I use regualr and I know it calls for premium but I've been using regular in all my BMW's.
Thanks
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 119K miles NOKIAN WR G3 30K miles
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23,464 Posts
Perhaps knocking pre-detonation beyond what your motors anti-knock can adjust.
 

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^ What he said. Try using the recommended octane when fueling up next time to see if it addresses your issue.

Also, @Doug Huffman makes it clear in his signature: "I am responsible for what I write, not for your understanding of it." 😅
 

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Premium Member
2016 BMW F32 435 ZHP
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Careful with the ethanol gas too - this could also do it. See if it does it more on a hot or a cold day. You could try running a tank of non-ethanol gas through it. Some stations sell it.
 
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