الميكانيكي ركب قطعة غيار، وقطعة الغيار كلفت كتير.

It is a mix, but it works well for Levantine learners.

• الميكانيكي, ركب, قطعة غيار, and كلفت are all words/forms that are also understandable in Standard Arabic.
• كتير is clearly colloquial and very common in Levantine. In Standard Arabic, you would expect كثيرًا instead.

So the sentence feels like everyday Arabic with a Levantine flavor, especially because of كتير.

A common Levantine-style pronunciation would be something like:

il-mīkānīkī rakkab qiṭʿet ġiyār, w qiṭʿet il-ġiyār kallafet ktīr.

A few useful notes:

• الـ is often pronounced il- or el- in Levantine, not al-.
• كتير is pronounced ktīr.
• In قطعة غيار, the ة of قطعة is usually heard as -et because the word is linked to the next noun.

Pronunciation varies by country and city, so you may hear small differences.

الميكانيكي is a borrowed word, ultimately from European languages, and it is very common in everyday Arabic for mechanic.

This is normal in Levantine. Arabic uses plenty of loanwords in daily speech, especially for jobs, technology, and modern life. So الميكانيكي is a very natural word to know and use.

Because in normal Arabic writing, short vowels and sometimes even the shadda are omitted.

Here, the intended verb is usually ركّب = to install / fit / put in place.

So although you see ركب, the meaning from context is:

• الميكانيكي ركّب قطعة غيار = The mechanic installed a spare part

Without vowel marks, Arabic often relies on context. A learner sees the same letters, but native speakers immediately understand the correct reading from the sentence.

It is an iḍāfa construction, often called a genitive construction or noun + noun construction.

Literally, it is something like:

• قطعة = a piece / part
• غيار = replacement / spare

Together, قطعة غيار means a spare part.

This is very common in Arabic: instead of using of, Arabic often puts two nouns together.

Also, in speech, قطعة often changes in pronunciation here:

• by itself: qiṭʿa
• in قطعة غيار: often qiṭʿet ġiyār

That happens because the word is connected to what follows.

This is about indefinite versus definite meaning.

• قطعة غيار = a spare part
• قطعة الغيار = the spare part

In an iḍāfa construction, definiteness is usually shown on the second noun.

So:

• غيار without ال makes the whole phrase indefinite
• الغيار with ال makes the whole phrase definite

That is why the first mention is a spare part, and the second mention is the spare part.

Arabic often repeats the noun where English would prefer a pronoun.

So both of these are possible in context:

• وقطعة الغيار كلفت كتير
• وكلفت كتير

Repeating the noun can sound clearer and more natural, especially when introducing or emphasizing it. Arabic is often more comfortable with repetition than English is.

Because the subject قطعة is feminine singular.

The verb agrees with it, so you get:

• كلفت = it cost, referring to a feminine noun

Since قطعة is grammatically feminine, the verb takes the feminine singular form.

So:

• قطعة الغيار كلفت كتير = The spare part cost a lot

Here, كتير means a lot or very much.

With verbs, كتير often works like a lot:

• كلفت كتير = it cost a lot

With adjectives, it often means very:

• غالي كتير = very expensive

So كتير is a very useful everyday Levantine word, and its English translation depends on what it is modifying.

Because Arabic does not need to say me if the idea is just it was expensive / it cost a lot.

So:

• كلفت كتير = it cost a lot
• كلفتني كتير = it cost me a lot

Both are possible, but the shorter version is perfectly natural when the person affected is obvious or not important.

Yes. A few natural alternatives are possible, depending on what you want to emphasize.

For example:

• الميكانيكي ركّب قطعة غيار، والقطعة كلّفت كتير.
• الميكانيكي ركّب قطعة غيار، وكانت غالية كتير.
• الميكانيكي ركّبلي قطعة غيار، وكلّفتني كتير.

These all stay close to the same basic idea, but they shift the focus a little:

• القطعة = shorter repetition
• كانت غالية كتير = focuses more on expensive
• ركّبلي / كلفتني = explicitly includes for me / cost me

So the original sentence is good, but there are several natural ways to say something similar in Levantine.