W124, New Parts Kits and Manuals

i have a 230te estste 1991 the problem is that i keep getting engine oil in the hydrolic suspension tank i know this as i have drained it off back down to empty after doing this within a week the oil light is back on on the dash and the suspension tank is full i cant see how it is happening would like to know how the oil can get into the tank .refrence it being lumpy it just feels like there is too much air in the tyres have set them to the correct pressure and that dosnt make any difference even tried a little less but no difference is that better info for you ps it rear hydrolic suspension

Roughly 5-10 minutes after start (seemingly on colder days) my 1978 300D emits a loud reverberating whine that seems to come from the driver's side of the dash. While intermittent, it is quite unsettling. The best description I can give for the sound is that it is similar to the sound one might hear from a poorly lubricated fan (where the grease in the motor is caked with grime). The sound happens without either climate control or defrost on. Is it A/C related or something more serious? I know the vacuum system is in that general vicinity, but what else might be causing the problem?