Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to winterize your mercruiser [title] Read your engine's owner's manual and all safety precautions. [step] Most owner's manuals have step-by-step winterization instructions. [title] Find any missing manual online at stern drive manuals.

Ending1: [title] Plan ahead and be aware that your engine has dangerous moving parts. [title] Perform a good tune-up to ensure the engine is running ok. Ending2: [title] Ensure that the cabin is properly ventilated before beginning to winterize your mercruiser. [step] Fresh air should be available to drive your mercruiser onboard safely as well as escaping into the area or landing as a safer method. Ending3: [title] Take your vehicle to stern drive if you're driving it at two-wheel drive. [title] To winterize your vehicle, create a positive spark transmission. Ending4: [title] If they say " winterize ", do not comply with its unavoidable rules, despite the fact that winterizing is just ready. [title] Verify that the engine turns with no rust or identifiable stains.

Answer format: ending1/ending2/ending3/ending4