An E24 lives or dies on rust in the front wings, footwells, rear suspension towers and clogged sill drains. Pin down whether the car is an early Karmann-built example, a later 635CSi or an M car before you talk money.
For this November 5, 2026 guide, I used the Hagerty UK E24 buying guide (November 22, 2022) and the Octane E24 buying guide. So, the checks below follow those specialists.
Know the production span
Hagerty UK says the E24 launched in 1976 and sold 86,216 cars over about 13 years. Early cars included the 630CS and 633CSi; the 635CSi followed in 1978. Octane notes that the earliest bodies were built by Karmann before BMW took production in-house.
Prioritize the post-1982 cars if you want a driver
Octane calls the post-1982 635CSi a sweet spot after the mid-life update that brought E28-based suspension and a deeper body kit. Hagerty UK also points buyers toward later 635CSi cars when budget rules out an M635CSi.
Hunt rust in the usual E24 traps
Hagerty UK lists front wings, inner footwells, rear suspension towers and door bottoms with clogged drain holes. It adds sills and sunroof drains that silt up, and damp or rust in the boot from brittle rear lamp gaskets.
Budget nose and valance damage
The same guide says the nose cover and the lower valance are prone to damage and expensive to replace. Look for misaligned trim and fresh underseal that might hide repairs.
Verify an M claim carefully
Hagerty UK treats the M635CSi as a different driving experience from the standard cars. Ask for documentation that matches the chassis and engine before paying an M premium. A badge alone is not evidence.
Drive and listen
Hagerty UK describes a healthy E24 as light on its feet for a large coupe. Listen for suspension knocks, check that the automatic or manual shifts cleanly, and ask for cooling-system and timing-related service records on the M30 six.
Use the history report for the right questions
Read title brands, dated odometer entries and changes of registration state before looking at service entries. Compare those events with the seller file and ask about gaps; a E24 that sat for decades can show long silences that are normal, while a sudden mileage drop is not. The federal NMVTIS program explains its title, salvage and junk data role; it does not replace a workshop inspection. Our rust-and-history explainer helps you separate a recorded conflict from proof of a particular fault.
Keep ownership paperwork separate from condition
Match the seller name to the title and request a written lien release where needed. Our lien-release checks explains the paperwork sequence. Federal odometer disclosure rules are summarized at Cornell LII, though older vehicles can be exempt from some disclosure requirements, so the absence of a mileage statement is not proof of anything by itself. Our paint-work explainer covers what a missing service entry can and cannot tell you.
Set the offer after the inspection
Ask for separate estimates for safety work, overdue servicing and cosmetic improvements. A hypothetical $1,500 repair reserve is only a planning example; it can be inadequate on an older collector vehicle. A seller PDF can be edited, so obtain your own report using the identifier stamped on the vehicle. Ask for restoration photos of the wings, towers and sills taken before paint, rather than after-only beauty shots.
We are a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck or Experian. Recent advertised pricing has been about $5.50 guest, $4.50 member or $6.75 for a bundle; confirm the price and included reports at checkout. Buy the report before committing, then keep it with the inspection findings and signed sale documents.
Ask for photos of wing, tower and sill repairs taken during the work. Bring a flashlight for the boot lamp seals and sunroof drains.
Book the inspection with a shop that has worked on this model before, and ask for a written report with photographs from underneath. Agree in advance who pays for the visit and what happens to your deposit if the findings are serious.
Check that the climate fan and both window regulators work, because failing regulators and brittle plastic trim are common ownership costs on these coupes. A short list of working electrics belongs in your notes before you discuss price.
Ask whether the cooling system has had a recent radiator, water pump and thermostat service. An M30 that has been overheated once is a different car from one with tidy coolant invoices.
Look, a clean engine bay can hide crusty towers, so do not let presentation stop the lift inspection.
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