Space Wagon first experiences/macking, alarm or warning?

Hello! After the first few kilometers with my fancy packwaggong there are a few things that make me very nervous: Today for the first time longer time on the road in Stop&Go, the stand gas speed is estimated at N about 600 and on D just so 550, must that be so? Do I also know of the Mazda Premcy automatic that he bubbling in the stand gas shortly before suffocating… In addition (I was scared short and stopped immediately): at this minimum speed the red oil control light flickered from time to time too weak . Can I explain this only in such a way that at the lowest speed not enough oil pressure is built up (oil level is 3/4 height between min and max), with some gas tips the lamp runs out immediately. In addition, sporadic in the stand a “hydroklappern” comes and disappears after a while increased speed again.(Have already been searched and read by vents by alternating a few minutes to 3000 rpm and stand gas) Should the oil level at stop maximum or rather something under it like now? In addition, the speed range in traffic jams comes from time to time to a kind of “roar squeaking/smiling noise”, can this be one of the belts, roller bearings or a WaPu bearing damage? Engine has 120,000 km down, is model ’99 GDI MOTION questions about questions, I know, I don’t expect a great remote diagnosis now, just wants to know if now an “ALARM” says because of one of the symptoms or if the usual age stacks are to be pointed out at the next inspection (would then be like this in About 7000 km due).