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Mazda RX-7 1993 oil

  

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Scotty , The oil im putting into my 13b (street ported) rotary is 20W-50 Royal purple with synerlic , (not factory spec) its been running reliably and like a dream. I'm a firm believer that not all but some vehicles do need the thicker stuff , in your experience what are the drawbacks of putting thicker oil into vehicles that require thinner stuff


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yes those are better with thicker oil because of that crazy engines design which has a tendency of burning oil and wearing out seals anyway


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