5W30 + 10W30 = 7.5W30???

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You can't predict exactly what viscosity you will get, but it would be in that range. You have to be careful what oils you are mixing. The Mobil 1 line is fully mixable with each grade because they share the same formula. Other oils do not and it's not advisable to mix bc you might have additives clash and effect the performance of the oil.
 
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