BMW E90 325i and 330i: cold-start and cooling checks before buying

When viewing an early BMW E90 325i or 330i, ask to see it start from cold and bring its repair history into the conversation. Unexplained ticking or a story about previous overheating deserves a workshop assessment before you agree on a price.

This guide focuses on early petrol sedans confirmed to have an N52 engine. It gives you two specific subjects to raise with an inspector, alongside the wider condition checks any used-car purchase needs. It does not cover the 320i, 335i, diesels, M3 or other body styles.

Confirm which car you are viewing

The E90 sedan launched in South Africa in 2005, and early local 325i and 330i six-cylinder petrol cars included N52 engines. The facelift arrived in late 2008, but South Africa did not receive identical engine changes to Europe. A badge, registration year or facelift appearance is therefore insufficient for applying overseas technical advice to an individual car. South African model history

Send the VIN and available records to your chosen specialist before the appointment. Ask them to confirm the actual engine and production details and explain which checks are relevant. If the seller mentions an engine replacement, request the supporting paperwork and include that in the inspection brief.

Treat ticking as a question to resolve

BMW North America documented ticking or rattling from hydraulic valve lifters on listed N52-family E90s. These are components in the engine's valve mechanism. The noise could occur after cold starts or short journeys, and sometimes remain when warm. That does not identify every noise as lifter noise or establish that it is harmless.

Ask a specialist to identify what you are hearing and whether BMW's guidance applies to that engine. The guidance considers previous lifter work and cylinder-head identification, making itemised repair invoices useful. It does not justify prescribing the same repair to every 325i and 330i. BMW's valve-lifter bulletin

Arrange the cold start with the seller in advance. If the car has already been warmed up, record that limitation and arrange another opportunity if your inspector needs one. Do not try to make a noise disappear through hard driving.

Ask what a cooling repair actually fixed

A separate BMW North America bulletin covers listed N52-family E90s produced through 31 December 2006, with check-engine or overheating complaints and coolant-pump-related fault codes. Its diagnostic process considers electrical supply, earth and communication problems as well as the pump. A warning or code alone does not settle which part needs replacing. Have the specialist confirm the car's build and engine before applying this guidance. BMW cooling-system bulletin, reproduced as a PDF on E90Post

Ask the seller: “Has it overheated, what was diagnosed, and can I see the invoice?” Request the findings behind a claimed repair. If overheating is indicated during a drive, stop safely and arrange professional assistance. Do not open a hot cooling system.

Turn the inspection into a buying decision

For the wider inspection, request a written report that separates confirmed findings from checks that could not be completed. Ask for an explanation of any unexplained symptom and a quotation for diagnosed work before negotiating a repair allowance. If the diagnosis remains uncertain, pause the purchase rather than guessing a budget.

Compare the advert, service entries and invoices, and ask the seller to explain discrepancies. Keep those records with the report so you can assess the evidence together. A receipt for earlier work is useful background, not a guarantee of the car's present condition.

Use our used-car buying checklist for the wider viewing and South African test-drive checklist to plan the drive. You can also find an E-Moto agent for buying or inspection support. Confirm BMW experience, equipment and written deliverables before booking, and agree on the scope in advance.

Sources checked on 19 September 2026. These are focused checks, not a complete E90 faults catalogue. The overseas technical documents establish neither South African failure rates nor local free-repair eligibility.