Cars and value
| Term | Meaning | More |
|---|---|---|
| Tier (Tier 1–5) | A car's rarity class. Higher tiers are rarer and worth more. Tiers are colour-coded in game; videos show Tier 3 in blue. | Tier list |
| Condition | The car's overall health as a percentage, shown in the notebook. Higher condition raises sale offers. | Repair guide |
| Part health | Each part (engine, radiator, battery and so on) has its own health reading in the notebook. | Repair guide |
| Rusty / clean | Community shorthand for a car before and after polishing and painting. | Paint shop |
| Net worth | Added September 5: your Cash plus the value of your vehicles. Newer junkyards display net worth figures on their signs. | Junkyard guide |
| Limited car | A car sold for a limited time, currently two Robux Store cars. | Limited cars |
| Auction-exclusive | A car obtainable only through auctions (or Cars & Bids). | Auctions guide |
| Badge name | The fictional brand the game uses, such as Ferdinand, Cobra or Bull, instead of a real manufacturer. | Limited cars |
Buying and selling
| Term | Meaning | More |
|---|---|---|
| Flip | Community word for buying a cheap car, repairing and painting it, then selling it for more. The main money loop. | Money guide |
| Junkyard | Where cars spawn for sale. There are four: the starter yard plus Regional, Industrial and Elite yards added September 20. | Junkyard guide |
| Spawn | A car appearing in a junkyard spot. A notification says which yard it spawned in. | Junkyard guide |
| Reroll | Paying to replace every car in a junkyard with new spawns. The Store sells rerolls (items named Junkyard 1–4) for Robux; Zach handles rerolls at the Industrial yard. | Junkyard guide |
| Quick sell | Selling instantly to Rick at the auctions, usually for much less than value. | Selling guide |
| Negotiate | Asking a buyer (Juan or Mr. Lupin) to raise an offer. Works in small steps; pushing too far can lose the deal. | Selling guide |
| Offer expiry | Mr. Lupin's offers can expire; you can request a new one. | Selling guide |
Auctions and premium currency
| Term | Meaning | More |
|---|---|---|
| Cash auction | An auction paid for with in-game Cash. Random outcome of Cash or a car. | Auctions guide |
| Premium auction | An auction that needs Premium Auction Keys and has better odds of rare cars. | Auctions guide |
| Premium Auction Key (key) | The item that opens premium auctions. Comes from codes, tasks and quests, or the Store (1 key for 99 Robux up to 50 for 2,999). | Game passes and Store |
| Odds | The chance of each auction outcome, shown in game. Odds change with updates. | Auctions guide |
| Cars & Bids | Added October 3: hourly player-versus-player bidding on a car at the luxury dealership, run by Ginger. | Auctions guide |
| Rookie Bid / Amateur Bid | Store items (29 and 79 Robux) listed alongside Cars & Bids on October 3. Exactly what they unlock was not documented when we checked. | Game passes and Store |
Building and tuning
| Term | Meaning | More |
|---|---|---|
| Engine swap | Replacing a car's engine with one bought at Car Zone, such as the V10 added August 16. | Engines and turbos |
| Turbo / supercharger | Forced-induction parts that add power. A supercharger engine was added for a limited time on September 5. | Engines and turbos |
| ECU tune | Tuning engine and gear settings in the tuning shop, added August 30. | Tuning guide |
| Gearing | Gear ratio sliders. Shorter gears give acceleration; longer gears give top speed. | Tuning guide |
| Fitment | How wheels sit: offset, camber and ride height, adjusted at Tire Zone. | Wheels guide |
| Drag build / highway build | Community terms for a tune aimed at acceleration or top speed. | Tuning guide |
| Speed trap | Roadside cameras listed in the August 16 update log that pay a small reward and show your speed. | Locations |
Roblox and community terms
- Robux: Roblox's paid currency, used for game passes and Store items. Cash is the separate in-game currency you earn by playing.
- Game pass: a one-time Robux purchase with a permanent perk, such as VIP.
- Developer product: a Robux item you can buy more than once, such as Cash packs or keys.
- Code: a text code redeemed in the shop for free rewards. Codes expire. See the codes page.
- Update day: the game describes itself as having weekly updates; most recent ones have landed on Saturdays (US time). See updates.
- Oil Leak: the Roblox group that publishes Junk Mechanics.
- CC (content creator): a creator in the game's content creator programme, who may see previews before release.