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Question about Synth Oil Conversion '89 90Q 10v

I am considering changing to synthetic oil (mobil 1)
The car has 121k miles on reg oil and is driven mod-hard in Northern Cali

>From what I understand -I should gradually convert to synth so my questions

1. how rapid and what ratio of synth to reg I should use during the
conversion be etc.

2. Is it worth synthetic for my model?

3. I am using 20-50 sae should I change oil type?