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Oil. Is it magic?

My 2.0 Lag I uses 15-40W semi synthetic
My GFs Clio uses 10-40W Semi synthetic
Halfords says that its ok to use 0-40W fully synthetic. in both. Are they saying that fully synthetic 0-40W give the same protection? How?
They also say that you get better economy. Anyone know how much? Is there a downside?
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