I have used Royal Purple here and there in my cars over the past few years because of its reduced engine wear. My question is what is the recommended oil change interval for their product? I cant find any answers for this.
I've got one of my Miatas running Royal Purple on 3000 mile/6 month intervals. Rather than take generic advice, though, I'd advise you to send oil samples out for analysis (it's about $25) once a year or so and actually know whether you could have gone longer, shouldn't have gone as long, or got the change interval about right- and it'll be a good guide to the health of your engine.
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