Can you mix ow 30 semi syn oil with reg. yamalube 0w 40. I reason I am asking is because I have about 4 quarts of the 0w 40 reg. oil left. Would it do any harm because the semi syn 0w 30 is half syn & half reg.
snowhite
Pro
What’s it gonna harm it’s all good oil!
03RX1-ER-LE
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You will just end up with 0W35
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No harm. use it up.
