Meu próprio carro está na oficina.

In Portuguese, possessives like meu/minha usually come before the noun:

• meu carro = my car

The adjective próprio also normally comes before the noun in this expression:

• meu próprio carro = my own car

So the order is:

• meu
  • próprio
    • carro

Forms like carro meu próprio are not natural here.

Próprio adds emphasis, like own in English.

• Meu carro está na oficina. = My car is at the repair shop.
• Meu próprio carro está na oficina. = My own car is at the repair shop.

It suggests something like:

• not someone else’s car
• even my own car
• the car that belongs to me personally

So próprio is not required for basic meaning, but it adds emphasis.

Próprio is an adjective, so it agrees with the noun it describes.

Here it describes carro, which is:

• masculine
• singular

So we use:

• próprio

Other forms are:

• própria for feminine singular
• próprios for masculine plural
• próprias for feminine plural

Examples:

• minha própria casa = my own house
• meus próprios livros = my own books
• minhas próprias ideias = my own ideas

Portuguese usually uses estar for location:

• O carro está na oficina. = The car is at the repair shop.

Using ser here would sound wrong, because ser is not normally used for where something is located.

A helpful rule:

• ser = identity, essential characteristics, time, etc.
• estar = location, condition, temporary state

So:

• Meu próprio carro está na oficina. = correct
• Meu próprio carro é na oficina. = incorrect

Na is a contraction of:

• em
  • a = na

Here:

• em = in / at
• a = the (feminine singular)

Since oficina is feminine, em a oficina becomes:

• na oficina

So:

• na oficina = in the repair shop / at the repair shop

Similar contractions:

• no = em + o
• nos = em + os
• nas = em + as

Examples:

• no carro = in the car
• na casa = in the house

No. This is a very common false friend.

• oficina = workshop / repair shop / garage
• escritório = office

So in this sentence, oficina means the place where a car is repaired.

If you translate it as office, the sentence becomes misleading.

Yes. In Brazilian Portuguese, both are possible:

• meu próprio carro
• o meu próprio carro

The version without the article is very common in Brazil, especially in everyday speech.

The version with the article can sound a little more definite or stylistically fuller, but both are natural.

So these are both acceptable:

• Meu próprio carro está na oficina.
• O meu próprio carro está na oficina.

Yes, a Brazilian could say it, but it has emphasis.

The most neutral everyday sentence would often be:

• Meu carro está na oficina.

Adding próprio makes it sound more emphatic, like:

• My own car is in the shop
• Even my own car is in the shop

So it is natural when the speaker wants to stress ownership or contrast.

Yes. Carro is the everyday Brazilian Portuguese word for car.

You may also see:

• automóvel = automobile, more formal
• veículo = vehicle, broader and more formal

But in normal speech, carro is the most natural choice.

In Brazilian Portuguese, próprio is commonly pronounced approximately like:

• PROH-pree-o

A few notes:

• The accent mark in pró shows the stressed syllable.
• The r in próprio is part of the consonant cluster pr.
• In fast speech, the middle can sound a bit reduced, so learners may hear something close to PRO-pyo or PRO-pree-o, depending on the speaker.

You do not need to pronounce it exactly like English proper or proprio in Spanish. Just aim for the stressed pró and a smooth ending.

Absolutely.

• Meu carro está na oficina. = correct
• Meu próprio carro está na oficina. = also correct

The difference is emphasis:

• meu carro = my car
• meu próprio carro = my own car

So próprio is optional unless you specifically want that extra meaning of own.