Oil and lead additive help wanted

Hello,

as owner of a Alfa Romeo Spider 2000 from 1973, I'm wondering wich is the best oil and lead additive to use. The manual tells me to use 10 W/50, but whats the difference between a 15 W/50 and a 20 W/50.

Any help appreciated

Dave

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Alfa Romeo
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Have a look at some of the oil company websites.

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Dave

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