Uh oh..
The turbo is supplied oil to cool and lubricate it, that oil then drains into the engine sump...if your hose has come loose, I'm amazed your car still has enough oil to run after two months, there'll be a lot of oil coming out...I wouldn't run the engine until fixed if that is the case.

Not quite sure what you mean by buzzing?

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD