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It is better, it does let you drive longer also, your engine will thank you later.
Do you know which type of full synthetic they are using? It should be a quality one and not some cheap "synthetic". Mobil 5w30, 10w30, etc are a good line. There are higher quality fully synthetic oils such as amsoil, royal purple, red line, gc green/gold, etc.
The filter is also just about as important as the oil itself, synthetic oil with a cheap fram filter won't help you much, you need a quality oil filter that flows more, lasts longer, etc.
What year and model/make car do you have? I'll recommend the perfect oil/filter for it.
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