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  1. MG ZS
    I'm thinking of switching back to 10/40 semi synth Magnatec. If I drain the Mobil that's in there and refill with the Magnatec would it be ok to top up using the left over Mobil 0/40 to bring it up to level? The mobil's fully synth and they're different viscosities but would save me an extra 10...
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