If a door has three hinges do you need a self-closing hinge on all three or just one

Just one, if it is a normal interior door. The heavier the door, the greater the need for additional force and thus more hinges. A heavy exterior door might require two or more self-closing hinges.

Is the tension adjustable?

Yes. The coil spring inside can be adjusted with a little or a lot. Door sizes and styles can vary, the tension helps to allow for the differences.

How tight is the tension to push the door open that is slightly ajar? It is a door that the dog uses but I don’t want it clsd all the way just slightl

You can vary the amount of "spring" in the hinge. I put this hinge on our hall powder room door because my wife left it open into the hallway all the time. Our 13 lb dog is a mama's girl and always follows my wife into the powder room. When she gets bored sitting there she can easily nose her way out when the door isn't latched (the dog, that is, not my wife).

Hello, how would I be able to oil or grease this hinge if it were to start squeaking?

Use graphite powder or graphite spray, not 3in1, wd, silicone, etc. WD 40 and other all purpose Oils/lubes tend to attract dust and dirt to the hinge, creating a gummy substance over time and causing squeaks to come back and hinges to drag. Graphite can get messy but if you take your time it will perform far longer than oil or other lubes will on locks, hinges, pulleys, etc.

Material	Nickel
Brand	amazon basics
Finish Type	Satin Nickel
Mounting Type	Door Mount
Net Quantity	1.0 Count
Global Trade Identification Number	00841511122160
Manufacturer	AmazonBasics
UPC	841511122160
Imported By	B07GF54KV8
Item model number	AB-DH550-SN
Product Dimensions	8.89 x 8.89 x 0.25 cm; 267.62 g
ASIN	B07GF54KV8

AmazonBasics Self-Closing 3.5" x 3.5" Door Hinge - 1 Piece - Satin Nickel

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