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Discussion Starter · #1 ·
I switched from Castrol GTX 5W30 (winter viscosity) to Mobil 1 10W40 last weekend, and it seems that the cars rev's freer, gets better gas mileage (15% over two tanks, but 5% is probably from slightly warmer weather), and in general just runs smoother...

Am I just imagining this? Or is synthetic just better?

I realize that there are many synthetic vs. mineral oil threads, but I couldn't help it..
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