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The DIY Oil Change Mistakes That Are Wrecking Your Engine (And Your Garage Floor) Changing your own oil should feel like a win — cash saved, bragging rights earned, maybe a cold drink after. Instead, most home mechanics turn it into a 20-minute slip-n-slide of 10W-30 all over the driveway. We're fixing that today, one dumb mistake at a time. Mistake #1: Pouring First, Measuring Never Here's the move everyone's grandpa taught them: crack the new jug, dump it in, check the dips