Yes, the noise comes from the oil filter, may be for a pressure reason,
actually my Sonata need ACEA A5 oil 5W30 , and the oil it has now is a 5W40
Castrol Softec, only ACEA A3; may be that under some temp conditions there
is too much pressure in the circuit and a valve near the filter begis
I will go to mechanic next week to fix the problem or at least to have an
answer that it is nothing to betoo much worried.
Why have a different oil in my Sonata? Probably because Castrol, who gives
oils for Hyundai motors here in Italy does not sell an ACEA A5 specs oil..
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