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New bonehead here figuring out the trails! Just got a 2008 Suzuki Z400, and the guy said he just did an oil change, but needs a little more because he was letting it cycle through before topping it off. He says he used ATV Power SAE 5W-40 Synthetic 4T Engine Oil, but the manual just says use 10W-40. He lives a couple hours away, where it's a little bit colder, so I'm assuming that's why he used 5W instead of 10W? Anyways, I only need a little bit more oil, and since it's already new in there, can I put the 10W in and let it mix? Also, does the brand being the same matter at all? I haven't gone out and looked in person yet, but actual ATV oil seems a bit expensive compared to just getting some standard oil at AutoZone, and the online manual I found isn't that clear on options. I'd appreciate some feedback and experience in this area, as well as the best place to get oil and filters when it's time. Thanks in advance!