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It would have been better if you would have stayed with conventional motor oil. My general rule of thumb is that what the manufacturer recommends is what I'll use.
The problem with switching to synthetic is that synthetic and conventional do not mix at all. This is what I've been told. After all, I'm not driving a 7 series BMW or an AMG Mercedes so I don't see the worthiness really in synthetics on low end vehicles.
I certainly would have asked the person changing your oil this question BEFORE switching.
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