01

Build a genuinely comparable pair

Record the generation, production date, original market, body version and full model designation for each car. BMW’s third-generation launch material includes distinct petrol variants, but those dated examples do not establish every later China-market specification. Do not copy one historical output figure onto all cars wearing the same badge.

Use the X3 generation and year record before judging the engine choice. A newer body, different wheelbase or different equipment package can influence the price independently. If the offers differ in several ways, keep each difference visible instead of attributing the entire price gap to 20i versus 30i.

02

Ask what the extra performance is for

Describe the customer’s ordinary journeys, passenger load and priorities. A buyer who values quiet urban travel may rank condition and cabin equipment above additional performance. Another customer may specifically want a verified higher-output version and be willing to accept its complete ownership budget.

Avoid inventing a universal recommendation from engine displacement alone. A competent road assessment of the actual candidate can help establish whether its operation suits the customer, within normal safe use. Advertised acceleration figures should remain tied to their original specification and test context, not become a promise about a used car.

03

Verify equipment independently of the badge

Compare the features that affect resale: seating, lighting, driver assistance, wheel configuration and the functions the customer actually needs. Do not assume that a 30i includes every option or that a 20i lacks a desired feature. Installed equipment and functioning equipment are separate questions.

The VIN and equipment checklist helps document the factory specification, later changes and demonstration results. For a batch, define mandatory features first. An attractive engine variant should not silently replace a requirement such as a particular seat function or verified phone connectivity.

04

Inspect both cars to the same standard

A well-documented candidate and one with unresolved faults cannot be compared solely by their badges. Request consistent inspection access, service records and descriptions of completed repairs. Keep mileage, prior use and present condition in the record without turning one odometer threshold into a universal acceptance rule.

If the more powerful car needs work, identify the cause, repair scope and completion evidence before treating a discount as value. If the lower-output car has been modified, retain the modification and support questions. Neither original appearance nor a performance claim substitutes for an assessment of the installed configuration.

05

Use running-cost assumptions transparently

Fuel consumption depends on the actual specification and use. Ask for comparable observations or applicable published references, clearly labelled by test basis. Do not calculate a buyer’s annual saving from two unrelated dashboard photographs. Use the same annual distance and fuel price when modelling two candidates.

Tyres, scheduled work and known preparation can also change the comparison. Price the fitted equipment rather than assuming that every 20i and 30i uses the same wheel package. Separate expected routine costs from unresolved repairs and keep a range where reliable figures are unavailable.

06

Read the premium on a complete basis

The dealer-price worksheet should name the vehicle, included preparation and delivery scope. Compare the premium only after both proposals have been normalised. A vehicle-only quote and a prepared-car quote can create a misleading impression of the cost of choosing the other engine variant.

Consider a dealer with customers who insist on 30i but have limited tolerance for missing equipment. The right purchase may be a suitable 30i with a clear condition record, or no purchase until a matching offer appears. A cheaper 20i is an alternative only if the customer brief genuinely permits it.

Ask whether the buyer is comparing factory-standard candidates or vehicles with disclosed changes. A modified lower-output car should not be presented as equivalent to a factory higher-output version merely because a seller claims similar performance. Keep the alteration, supporting records and receiving-workshop assessment visible, and use separate offers if the modification changes the buyer’s accepted specification or support needs.

07

State the acceptable alternatives

Send the preferred full model designation, generation, market, body and condition with your enquiry. Explain whether 20i and 30i are both acceptable, and list the requirements that remain mandatory across alternatives. Ask for separate candidate sheets rather than one blended price range without vehicle identities.

For new sourcing, request current available candidates and delivery specifications. For used sourcing, add service and inspection evidence. Approval should attach to the selected VIN and complete offer, so a later substitution cannot change performance, equipment or condition while retaining the same headline description.