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I live in New Jersey and have both an 88 740 Turbo Wagon and 91 Bertone Coupe (turbo). The previous owners of both cars recommended 10W-30 year round.
The main concern is to make sure your dyno-oil says "TURBO APPROVED". Non turbo approved oils can't take the heat within the turbo.
I switched to Mobil-1 for the Coupe, since the mileage is only 65,000.
Be sure to let the car idle for a short time before turning off the engine
(cool off time). Also, when you 1st start the car - allow a 20 second idle period before taking off. This will allow oil from the pan to get up to the turbo.
Ed
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