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Message: <blockquote data-quote="wolverine" data-source="post: 51230" data-attributes="member: 532">Hi Yee Sang,My bro has an E30.So I'll share an experience we've had with his E30.But firstly,ur description is still not very clear till we stand by ur car and listen to it.So here goes...a)   On the first occassion,there was this tapping noise from his engine when it's at normal temp.Some mechanics told that it could be the tappets,a/c pump bearing,altenator bearing,conrod bearing,piston slapping, one of the plug wires are leaking when it's hot and so on....till someone even suggested to overhaul the engine.As the noise came only from the top of the engine and when it's hot,I suggested to him to change the engine oil...especially after he told me he poured in one of the engine treatment...somehow it disturbed the engine oil's viscosity causing the oil pressure to drop when it's hot and not really lubricating the top.He serviced the car and the problem went away.Hope this helps...Btw, what's ur idle in the morning and during the normal temperature? If possible,join one of the tt sessions here and there are a lot of sifus here who can help u if they could listen to ur car. :yes:</blockquote>