Pretty big puff of oil smoke at cold start-up

[Tom Daily]

Been happening for 2 weeks; about 75% of my cold starts result in a pretty big oil puff, which goes right away as I drive off. Car does not consume oil between changes & I use Mobil 1, chg at 4000 mi. Car has 73K on it. Whatta 'ya think? Seals? Leaky something?

Many Thanks, Tom Daily, Brookline, MA
'91 2K 20VTQ--Bamboo 73K--IA Stage III; Moda 17x235x45 Pilot Sport A/S; Xenarc HID driving lights (Winter)
'86.5 928 S3 Auto, Iris Blue 70K (Summer)
'90 V8 Quattro Metallic Gray 95K