Soaking wet Kimmie was discovered in the rain by a member of the public in Homebase's car park in October last year.
Just 13-months old, the tabby and white cat was brought into the Mayhew Animal Home where shocked staff found her severely underweight.
Staff said Kimmie, who they named and said was discovered in a wire top cat carrier, had been lying in engine oil.
Mayhew’s animal welfare officer, Tania Mazzoni, said: "We can’t say how long Kimmie had been outside in her cat carrier for, but she was wet, freezing cold, and very skinny.
"Where pet owners are having difficulty, we urge them to contact us first and we will see what we can do to help.
"If owners called us in the first instance, we can help in many other ways rather than the last resort of them dumping their pet.
"As animal welfare officers, our job is to help pets and advise their owners on the best course of action.
"We are here to help the animal and prevent suffering, no matter what the problem is, we do not judge anyone."
Her whole body was twitching, thought to have resulted from the intoxication of the oil when she tried to lick herself clean.
The oil covered most of her body to the extent where she could not move her hind legs freely, which were sticking to the stomach wounds.
Staff were forced to sedate her so they could clip and clean the animal, and had to put her on pain relief before she woke up again.
It took her more than a month to recover, but Kimmie was whisked away by a new owner two weeks ago and is said to be enjoying life at her new home, with the new name Pepsi.
New owner, Sam, said: "I adopted Kimmie, now called Pepsi, from the fabulous Mayhew Animal Home.
"She loves her new home, has settled in very well and follows me around everywhere. She also loves watching the TV and chasing shadows."
Keep up to date with the latest news in west London via the free getwestlondon app.
You can even set it to receive push notifications for all the breaking news in your area .