Hi,
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I do not bad eggs smell
I'm not entirely sure whether you mean you are getting bad egg smell or not.
"Bad egg" smell is basically hydrogen sulphide H2S and maybe with some sulphur dioxide SO2. This invariably comes from the fuel. It is vaguely possible some may come from the oil but generally speaking there is little or no sulphur in engine oil (there is plenty in gear oils). It depends on exactly how the feedback works alongside the type of catalyst elements used as to whether any sulphur comes through as H2S (low oxygen availability) or SO2 (more oxygen available), it is not usually possible to predict exactly how a vehicles system will behave.
I don't know what country you are in, is the fuel of good quality or can it be variable? Some eastern europe countries can get poor fuels being "dumped", I have had experience in industry with high volatility fuels being dumped into eastern europe in summer causing widespread vapour locking in car fuel systems.
I'd suggest trying to get some fresh fuel from a good branded outlet with a high turnover of fuel so that the chances of getting low quality stuff is minimal.