I even have pics of this one.
Since we don't have oil spouts to jam into a oil can, using the bottles of oil can get a little messy. I always end up dripping oil on the valve cover and onto the manifold. I'm also cheap...
So... I take a oil bottle and cut the bottom off and use it as a funnel.
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I also cut the top off another bottle. Being cheap, I hate to waste the oil left in the bottles after dumping them in the engine. There's always a little left, so I let the bottles drain into this cutoff bottle. Then I usually dump that in the engine... Or use it for filling my oil can.
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Then I take the "funnel" and stuff it in the cutoff bottle and that's how it's all stored, keeping it clean for the next use.
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A cutoff windshield washer gallon jug is great for filling radiators too.
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No pics for this one, but a pool noodle from Wally World is stuck on my jack handle. Saves the lower pans from scratches.
A used hockey puck (told you I was cheap) works great in the jack if you need something to pad the surface you are jacking. I use a 2x4 cut into a square to use where the puck won't work.
With the C-body so long, I want it to just fit into the garage... Enough to close the door and maximize the space in front. I tried stuff like tennis balls on strings and crap like that. I never liked things hanging when the car isn't in the garage, so that never worked. I painted a spot on the floor where I put a 2x4 and just toss it down and roll the car's tire up against it.
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If you look in front of the radiator in my 300, there's a cut up tennis ball riding around on the splash pan. That goes over the latch on the hood when it's up. That keeps me from knocking my head against the latch.