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I found a great deal on a bunch of 50w oil. Question: I don't need that much weight in my oil. I want to drop the 50w down to a 30w. What can I add to the oil to thin it down to 30w? I need to know what to add and what the exact ratio would be.. Thanks

Hi everyone, it's good to be here. I am hoping to learn a thing or two. I realize that oil is a very important aspect of a good running engine. I am interested in finding out what the best oil is for my mechanical items. Do I need zinc, what weight oil do I use for the conditions I am driving...