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733 Posts
Discussion Starter · #1 ·
5w20 would be the same with either standard or synthetic?

New engine, though.

With older cars (200k miles), don't parts wear out, needing a thicker oil to fill larger gaps? Like a plain 30w, or a 10w40?

On previous cars I just put 30w in summer, then change to 10w30 in the winter.

What would someone who knows what they're doing, do?
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