BMW E24 6-Series, Frequently Asked Questions

Buying and Ownership

How much does a BMW E24 6-Series cost in Australia in 2026?

The market has settled after strong growth in the early 2020s. A running, roadworthy 635CSi in reasonable condition starts around $35,000-40,000 AUD. Clean, sorted examples with documented history fetch $50,000-70,000. The M635CSi is a different proposition entirely, expect $100,000-150,000 for a good driver and $150,000-200,000+ for a concours-quality car. Project cars (running but needing significant work) can be found for $10,000-20,000 for a 635CSi, but be realistic about restoration costs, a full restoration typically costs $30,000-60,000 in parts and labour.

Is the E24 a good first classic car?

No. The E24 is mechanically straightforward for an experienced enthusiast, but it’s not a car for someone who’s never worked on older vehicles. The rust inspection alone requires knowledge and experience, missing a corroded subframe mount could be dangerous. Parts sourcing requires patience, the electrics can be frustrating, and workshop costs add up quickly if you can’t do basic maintenance yourself. A better first classic BMW would be an E30 or E34, where parts are cheaper and more readily available.

Can I daily drive an E24?

You can, but you probably shouldn’t. A well-sorted 635CSi is a comfortable, capable grand tourer that handles modern traffic perfectly well. The M30 engine is reliable, fuel injection cars start readily, and the suspension is compliant enough for commuting. However, daily driving exposes the car to stone chips, car park dings, and the wear-and-tear that degrades a classic car’s condition. UV exposure alone will accelerate dashboard cracking and interior trim fading. Most E24 owners use them as weekend and event cars, with an occasional longer road trip. If you want to daily drive, budget for increased maintenance and accept that the car’s condition will decline faster than a garaged weekend car.

Which E24 variant is the best value?

The late-model 635CSi (1985-1989) with Motronic engine management is the sweet spot. It gives you 90% of the E24 experience at a fraction of the M635CSi price. The Motronic system is significantly more reliable than the earlier L-Jetronic, the 3.4-litre M30 is powerful enough to make the car feel fast, and parts availability is best for this variant. The manual gearbox is strongly preferred, the automatic is adequate but dulls the driving experience.

Manual or automatic?

Manual, unequivocally. The Getrag 265 five-speed manual is a joy to use, the shift action is precise, the ratios are well-chosen, and the mechanical connection between driver and drivetrain is a core part of the E24 experience. The ZF 4HP22 automatic is competent but makes the car feel lazy. Manual cars also hold their value significantly better, a manual 635CSi can be worth 20-30% more than an equivalent automatic.

Maintenance

What are the essential maintenance items for an E24?

The critical items, in priority order:

1. Cooling system, Replace all rubber hoses, expansion tank, thermostat, and water pump if age and condition are unknown. An overheating event can destroy the engine. Budget: $700-1,200 in parts.
2. Timing chain and tensioner, Inspect and replace if rattling on startup. Budget: $800-1,500 at a specialist.
3. Oil filter housing gasket, This O-ring leaks oil onto the exhaust manifold and is a fire risk. Budget: $30 for the gasket, 1 hour labour.
4. Brake fluid flush, Brake fluid absorbs moisture and degrades. Flush every two years with DOT 4 fluid. Budget: $50-100.
5. Differential mount bushings and guibo, Replace if clunking from the rear. Budget: $200-400 in parts plus labour.

How often should the oil be changed?

Every 10,000 km or annually, whichever comes first. Use a quality 15W-40 or 20W-50 mineral oil for the M30 (these engines were designed for mineral oil and the seals can shrink with full synthetic), or a quality 10W-60 full synthetic for the M88. Always use a genuine Mann or Mahle oil filter. Oil capacity: approximately 5.5L for the M30, 6.0L for the M88.

What coolant should I use?

BMW Blue coolant (or equivalent ethylene glycol-based coolant meeting BMW spec) mixed 50:50 with distilled water. Do not use tap water, the mineral content causes internal corrosion and blocks the heater core. Coolant should be flushed and replaced every two years. Capacity: approximately 11.5L.

How long does the M30 engine last?

With regular oil changes and a functioning cooling system, the M30 routinely exceeds 300,000 km before needing significant work. There are documented M30 engines with over 500,000 km on the original bottom end. The M30 is one of the most durable engines BMW ever produced. The weak points are the head gasket (prone to failure if the engine overheats) and the timing chain and guides (which need replacement around 200,000-250,000 km). The bottom end, crankshaft, bearings, and block, is essentially indestructible under normal use.

What spark plugs does the E24 use?

The M30 engine uses Bosch W8DC or NGK BP6ES (non-resistor) or BPR6ES (resistor type, for cars with electronic ignition). The M88 uses Bosch W8DTC or NGK BPR7ES. Gap setting: 0.7-0.8mm for both engines. Replace every 30,000 km. Do not use platinum or iridium plugs, the M30 and M88 were designed for conventional copper-core plugs and the different heat characteristics of exotic plugs can cause issues.

How do I maintain the pillarless door seals?

The pillarless coupe doors rely on rubber seals to keep water and wind noise out. Clean the seals every three months with mild soapy water, then apply a silicone-based seal conditioner (such as Gummi Pflege or similar). Do not use petroleum-based products, they swell and degrade the rubber. Check the window alignment twice a year, the windows must seal firmly against the roof channel when closed. Misaligned windows cause wind noise and water leaks.

Technical

What weight oil should I use in the M30?

For Australian conditions, 15W-40 mineral oil is the standard recommendation. In hot climates (summer temperatures above 40C regularly), 20W-50 provides better protection. Some owners run 10W-40 semi-synthetic without issues, but full synthetic oils can cause oil leaks on engines with aged cork and rubber seals, the detergents in synthetic oil clean deposits that were acting as sealant. If you’ve done a full reseal with modern gasket materials, 10W-40 synthetic is fine.

Can I upgrade the L-Jetronic to Motronic?

Yes, and it’s one of the most worthwhile modifications for early 633CSi cars. The conversion requires the Motronic ECU, engine wiring harness, distributor (Motronic uses a different distributor without mechanical advance), and intake manifold from a Motronic-era car. The conversion is well-documented in the E24 community. Parts cost: $500-1,000 from a wrecker. Labour: 8-12 hours. The result is significantly better driveability, fuel economy, and reliability. Some purists object, but the Motronic conversion is considered an acceptable modification by most E24 enthusiasts.

What differential ratio does the E24 use?

Standard E24 differential ratios varied by model and market:

• 633CSi manual: 3.25:1
• 633CSi automatic: 3.25:1
• 635CSi manual: 3.25:1 (early) or 3.07:1 (late)
• 635CSi automatic: 3.25:1
• M635CSi: 3.25:1 with limited-slip

The 3.25:1 ratio provides a good balance of acceleration and highway cruising. The 3.07:1 on late 635CSi models was fitted for better fuel economy and reduced noise at highway speed, but some owners find the car less eager from a stop. The limited-slip differential on the M635CSi (and optional on the 635CSi) is a 25% lockup unit.

Is the E24 hard to work on?

The M30 engine bay is relatively spacious by modern standards, and the mechanical components are straightforward. Most routine maintenance (oil changes, spark plugs, filters, belts) can be done by a competent home mechanic. The timing chain is at the front of the engine and accessible, unlike the E30’s M20 with its rear timing belt. The main challenges are: accessing the rear of the engine (heater hoses, some sensors), working on the pillarless doors (complex regulators, tight spaces), and dealing with 40-year-old wiring connectors that are brittle and fragile. The M88 engine in the M635CSi is significantly more complex and is best left to specialists.

What are the torque specs for the wheel bolts?

E24 wheel bolts: 110 Nm (81 lb-ft). Use a torque wrench, overtightening can warp the brake discs and damage the bolt threads. The E24 uses 12mm x 1.5 pitch bolts, 28mm shank length for standard wheels, 31mm for some aftermarket wheels. Always check the shank length when fitting non-original wheels.

Parts and Servicing

Where do I source E24 parts in Australia?

Primary sources:

• BMW dealers, Still stock many mechanical parts (gaskets, seals, filters, brake components) through the BMW Classic Parts programme. Prices are high but the parts are genuine.
• Pelican Parts / FCP Euro, US-based online retailers that ship to Australia. Excellent range of OEM and aftermarket parts. Shipping takes 2-3 weeks.
• Walloth & Nesch, German specialist in E24 parts. The best source for hard-to-find body and trim parts. Shipping from Germany takes 3-4 weeks.
• Local wreckers, Check Gumtree and Facebook E24 groups. Australian E24 wrecks are becoming rare, so act quickly when one surfaces.
• Realoem.com, The essential parts catalogue. Enter your VIN and it shows every part on the car with part numbers.

How much does a service cost at a specialist?

A basic service (oil, filter, inspection) at a BMW independent specialist costs $300-500 AUD. A major service (oil, filters, spark plugs, valve adjustment on M88, brake fluid flush, coolant check, suspension inspection) costs $600-1,000. Hourly labour rates at BMW-specialist independent workshops range from $120-180/hour. Dealership rates are $200-280/hour and generally not recommended for E24 work, most dealer technicians have no experience with these cars.

What insurance should I get?

Agreed-value insurance through a classic car insurer is essential. General insurers will market-value the car based on generic data and will undervalue it. Recommended Australian classic car insurers: Shannons, Hagerty, Grundy, and RACV Vintage & Classic. Get the car professionally appraised and insure it for the appraised value. Premiums typically run $800-1,500/year for a $40,000-60,000 agreed value, depending on your age, driving history, and usage. Some policies require the car to be garaged overnight, check the conditions carefully.

Are there any E24 clubs in Australia?

The E24 falls under the broader BMW car club umbrella. The BMW Car Club of Victoria, BMW Car Club of NSW, and equivalent state clubs all welcome E24s. There is no dedicated E24-only club in Australia, but the E24 community is active on social media, the “BMW E24 6-Series Owners Australia” Facebook group is the most active online community. International resources include Bimmerforums.com (E24 section) and the E24 section of MyE28.com (which covers both E28 and E24).

Modifications

What are the recommended modifications for an E24?

The best modifications are those that address known weaknesses without changing the car’s character:

1. Cooling system upgrade, Aluminium radiator, metal-impeller water pump, silicone hoses. Improves reliability, not appearance.
2. Ignition upgrade, If running L-Jetronic, convert to Motronic. If already Motronic, the system is fine as-is.
3. Suspension refresh, Bilstein B6 dampers, new OEM springs, polyurethane control arm bushings. Restores the factory handling without making the ride punishing.
4. Stainless steel exhaust, Replaces the factory mild steel exhaust that rusts. Improves flow slightly and sounds better. Cost: $1,500-2,500 for a custom stainless system.
5. ARP head studs (M30), Replaces the factory stretch bolts with stronger studs, preventing head gasket failure. Do this when the head gasket is next replaced.

Can I fit wider wheels and tyres?

The standard E24 wheel is a 14x6.5” or 16x7” alloy. The most popular upgrade is the BMW “Style 5” TRX wheel (390mm metric) or the more common 16x7.5” or 16x8” BBS-style wheel. Maximum practical tyre size without modification is 225/50R16 on 8” wheels. Going wider than 8” on the rear requires careful attention to offset (ET) to avoid rubbing on the inner arch. The front is more restricted, 7.5” is the practical maximum without guard rolling. Stick with an ET of 20-24mm for the rear and 15-20mm for the front.

Should I lower my E24?

A modest drop of 20-30mm improves the stance and reduces body roll without compromising ride quality. Eibach Pro-Kit or H&R Sport springs are the recommended options, paired with fresh Bilstein B6 or Koni adjustable dampers. Do not drop more than 30mm, the E24’s geometry goes negative quickly, and the steering geometry suffers. Coilovers are available but unnecessary unless you’re tracking the car. A dropped E24 on the stock Sport suspension setting (which was only 10-15mm lower than standard) looks purposeful without being aggressive.