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I used that very oil in my turbocharged Vw corrado,i put it in in place of shiyte mineral oil used for running in.
My grade was 5/50 though but the oil pressure is still exellent at 2.0Bar idle(considering also the 35+degree outside temps).
I've always found Mobil 1 to be 1 of the best oils available.
No smoke and no oil consumption either.
Your Cosworth engine is very similar to the Vw twin-cam 2.0 engine so i say go for it.
Thanks for all the replys!..didnt want to just shove it in, incase it wrecked the engine....It sounds the part though so it'll be going in on the weekend!