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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?