Start with the work each document covers
When comparing an initial engine estimate with a quote issued after dismantling, start with the stated scope. Spanish workshop guidance describes a written estimate identifying the proposed work and an itemised total. Read those together: what does the workshop propose to do, and which items make up the price? Treat the document’s title as a starting point, then ask for a clear account of what the quoted work includes.
Separate investigation from the repair decision
A useful way to read the paperwork is to separate inspection or dismantling from the repair that may follow. Ask the workshop to identify those stages and state which one you are being asked to approve. Record what is included now, what remains open and which later decisions require another discussion. This gives you a practical comparison without assuming that authorising an investigation also settles the scope of every subsequent repair.
Ask what was observed and what remains uncertain
Ask the engine specialist to distinguish the recorded observation from the proposed explanation and repair. Read a newly listed fault as a finding to discuss, rather than treating its appearance on a revised quote as a complete diagnosis of the cause. Request a plain explanation of what the specialist has checked, what remains unresolved and how the proposed work relates to the finding. Keep those questions alongside the estimate for your review.
Compare the two scopes item by item
Place the initial estimate beside the later quote and compare the descriptions before comparing the totals. Mark which work appears in both, which items have been added and which earlier items are no longer proposed. Ask for unclear descriptions to be explained in ordinary language. The practical aim is to identify the current proposal and its open points, rather than infer the reason for a price change from the total alone.
Make additional work a separate decision
Spanish workshop rules distinguish newly discovered faults from work already accepted and call for express agreement before the additional repair. If the later quote introduces further work, ask the workshop to identify it clearly and explain what approval it needs. Keep your decision specific to the listed proposal. This distinction helps you review additional work without assuming that the initial estimate automatically governs every item introduced at a later stage.
Keep a clear record before proceeding
Before deciding, bring together the proposed scope, itemised total, unresolved questions and any additional work awaiting agreement. If the vehicle stays at a workshop in Spain, the rules also describe a deposit receipt and circumstances in which a signed estimate can serve that purpose. Keep the relevant paperwork together. Use it to check what has been recorded and agreed, while asking the specialist to clarify any remaining uncertainty about the repair proposal.