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motor oil , which one??



Hello, Finally  re-subscribed thanks to everyone!
 
What does the list say about which oil weight to use??  Here's the scenario
 
Question:  88 16V 1.8L with rebuilt head and rebuilt motor:
After I do the 3000 miles of breaing in, which I have 500 miles so far with 10w-40 oil, what oil weight should I use?
Should I stay with organic 10w-40 (as per my mechanic)? or
go to 20w-50(mechanic says no need to b/c everything is new in the motor)?
 or switch to synthetic (mechanic says no big difference)?
 
Peace
Rich Z