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Location: Nanjing, China
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5w30 should be fine. Is that a Synthetic? I only use Castrol Syntec on my car (may switch to Mobil1). It may not kill your car to do it once, but the engine is really meant to run on synthetic. If you are going to buy more oil to complement what you have, I would suggest to at least get the same weight. Otherwise you will have different-sized particles doing weird stuff with each other at the molecular level. It may not be catastrophic, but why do it if it can be avoided.
5w30, 5w40, etc., is the oil weight. That is why I was recommending that if you already have 5 qt of 5w30, that the other oil you buy is also 5w30. So, the same grade.
The previous owner of my car, even through the dealership warranty, and I always put 5w30 in my car.
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