Does the tube have oz measurements?

It shows in cubic centimeters up to 200. And up to 2.0 deciliters.

How do you stop the extension hoses from falling out ?

You don't. It's a terrible design. I ended up buying some flexible rubber hose and using a hose clamp to hold it on the end of the first extension that's held in securely. I lost the extension in a very tight spot that took hours to remove so be careful

Are the "rubber" o-rings just rubber or are they able to stand up to automotive fluids?

this pump has good Orings....you will be able to removed ..fluids power.steering.brake fluid and coolant......

Does anyone have a guess on the lube used on the o-rings? Curious what to use in the future.

Silicone grease is a good bet. I use 3M Silicone Paste. Name varies by brand, sometimes called silicone dielectric grease or paste. Works very well, lasts a long time, doesn't degrade like soap+oil based grease and won't degrade the rubber of the o-ring. Also handy for spark-plug boots and general rubber/plastic preservation under the hood (at least the 3M stuff I use is). Don't overdo it, a little dab'll do you, just wipe it around the o-ring with your fingers and don't leave excess blobs. Only exception to silicone grease would be if you're using this to dispense paint of some sort, then I'd stick to soapy water (drop of Dawn dishwashing detergent in a tablespoon or so of water). Works well for installation but all dried up by the time you take it apart, still better than dry because installation is the more likely cause of damage :)

Manufacturer	Thorstone
Brand	Thorstone
Package Dimensions	31.09 x 7.19 x 6.91 cm; 281 g
Item model number	TFEP-02
Item Weight	281 g

Thorstone 自動車用流体抽出ポンプ オイル交換シリンジ ホース付き 手動燃料吸引&フィラー 流体オイル交換エバキューエーター (7オンス/0.21クォート/200CC)

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Thorstone 自動車用流体抽出ポンプオイル交換シリンジホース付き手動燃料吸引&フィラー流体オイル交換エバキューエーター (7オンス/0.21クォート/200CC)