Also when cold the oil is thicker, which makes for more drag on the turbo bearings. I get a lot more boost lag when the engine is cold. Some people have said synthetic oil helps with this.

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1981 Mercedes 300TD, 1994 Honda Civic Del Sol
http://mefi.us/images/fuelly/smallsig-us/67195.pnghttp://mefi.us/images/fuelly/smallsig-us/103885.png

Not only that, the ALDA switchover valve engages--ro remove enrichment--when the engine is cold, for something called (or similar, from memory) "torque control."

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k

Interesting. At the moment I have neither ALDA nor switchover valve on my car but it's still sluggish first thing in the morning.

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1981 Mercedes 300TD, 1994 Honda Civic Del Sol
http://mefi.us/images/fuelly/smallsig-us/67195.pnghttp://mefi.us/images/fuelly/smallsig-us/103885.png

If it is cold thick engine oil ?

An oil pan heater will help.

Pad type oil pan heater.
https://www.google.com/search?q=oil+pan+heater&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a#sclient=psy-ab&hl=en&client=firefox-a&hs=GH3&rls=org.mozilla:en-US%3Aofficial&source=hp&q=engine+oil+pan+heater+pads&pbx=1&oq=engine+oil+pan+heater&aq=1&aqi=g2g-v2&aql=&gs_sm=c&gs_upl=0l0l1l3805l0l0l0l0l0l0l0l0ll0l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=ea6ae9a9dec1fb30&biw=1280&bih=830

Magnet type oil pan heater.
https://www.google.com/search?q=oil+pan+heater&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a#pq=engine+oil+pan+heater&hl=en&cp=9&gs_id=5l&xhr=t&q=magnetic+engine+oil+pan+heater&tok=hAo4Tbt2bMYcgRI76S7r2A&pf=p&sclient=psy-ab&client=firefox-a&hs=vxN&rls=org.mozilla:en-US%3Aofficial&source=hp&pbx=1&oq=magnetic+engine+oil+pan+heater&aq=0v&aqi=g-v1&aql=&gs_sm=&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=ea6ae9a9dec1fb30&biw=1280&bih=830