Reasons it COULD be worth it:
* Low price: $600 is very cheap for a running car, even one needing some work.
* Only the timing belt: If that's truly the only mechanical issue, the repair cost is relatively manageable compared to the potential value of the car once fixed. A timing belt replacement, including parts and labor, might cost $500-$800 depending on your location and who does the work.
Reasons it MIGHT NOT be worth it:
* "Hard to do" timing belt: While the job is not exceedingly difficult for a competent mechanic, it *is* labor-intensive. A mechanic might charge a higher rate because of this, eating into your potential savings.
* Hidden problems: A car that's been neglected enough to need a timing belt replacement might have other underlying issues. Ignoring a timing belt for so long may mean other things have worn out prematurely, possibly due to a lack of maintenance. Inspect the car thoroughly for rust, damage, and other potential issues.
* Interface Engine (Meaning unclear): Your mention of an "interface engine" is unclear. If you mean the engine's interface with other components, it may be more than just the timing belt. There might be other problems in this area that are related to the belt.
* Parts cost: The cost of the timing belt and related components (water pump, tensioner) can vary.
Before you buy:
1. Thorough inspection: Take the car to a trusted mechanic for a pre-purchase inspection. This is crucial. This inspection will identify hidden problems and give you a realistic estimate for the timing belt replacement.
2. Negotiate the price: Knowing the cost of repair will allow you to negotiate a lower price. You could aim for something significantly below $600.
3. Research: Look up the average value of a 1996 Monte Carlo Z34 in your area to see if even with the repairs, it's a fair price. Sites like Kelley Blue Book or Edmunds can help with this.
In short: It *could* be a good deal, but proceed with extreme caution. The pre-purchase inspection is non-negotiable. Weigh the cost of repair plus the car's value against the potential risks of hidden problems. If the total cost (repair + purchase price) exceeds the car's fair market value, walk away.
