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What's up man. I've had 3 rx7'rx7's so hopefully that qualifies me to answer this. Some may have different opinions. For oil, I usually use 20w50 in the summer and 10w40 in the winter though I think 20w50 year around would be ok. I now live in south GA. So I'll probably run 20w50 year round. It doesn't get very cold.
Rotary engines do use oil in the gas like a 2 stroke but they have kind of an oil injection system so you shouldn't have to mix it yourself. Just gas and go. It doesn't use that much oil though so you shouldn't have to add oil to often but it's always good to keep an eye on it as with any old car. But if you don't have any leaks and it is running good you shouldn't have to add anything more than a quart between oil changes. Hope that answers your questions. Have fun with the rx7. Fun cars.
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