Porsche 964/993, The Complete Buying Guide

Overview

The Porsche 964 (1989-1994) and 993 (1994-1998) are the last air-cooled 911s, the final expression of the flat-six, rear-engined sports car concept that began with the original 911 in 1963. They are, in the eyes of many Porsche enthusiasts, the definitive 911s: modern enough to drive every day, analogue enough to feel genuinely connected, and powered by the last generation of the air-cooled flat-six engine that defined the 911’s character.

The 964 modernised the 911 with power steering, ABS, and coil spring suspension (replacing the torsion bars that had been used since 1963). The 993 refined everything, smoother bodywork, improved suspension, more power, and the VarioRam induction system. The 993 is often called the most beautiful 911 ever made.

Both are serious money. The days of buying a rough 964 for $60,000 are gone. These are established blue-chip classics with values that have been climbing for a decade. Buying well is critical, the difference between a good car and a bad one can be a six-figure repair bill.

Which Model to Buy

964 Range (1989-1994)

964 Carrera 2 (C2): Rear-wheel drive, 3.6-litre M64 flat-six, 250bhp. This is the purist’s choice, the lightest 964 and the most engaging to drive. Available as coupe, Targa, and cabriolet. The manual C2 coupe is the most sought-after variant for enthusiasts.

964 Carrera 4 (C4): All-wheel drive, same 3.6-litre engine. The C4 was actually the first 964 variant released (1989). The AWD system adds approximately 75 kg and slightly dulls the steering feel compared to the C2. More secure in the wet but less pure in character. The AWD system is complex and expensive to service.

964 Turbo (3.3L): The initial 964 Turbo used a turbocharged 3.3-litre engine producing 320bhp, essentially the same engine from the 930 Turbo but with updated ancillaries. Rear-wheel drive, 5-speed manual. Serious performance but the single-turbo setup has noticeable lag.

964 Turbo 3.6: From 1993, the 964 Turbo received a new 3.6-litre turbocharged engine producing 360bhp. Only about 1,437 were built, making it rare and very valuable. This is the better Turbo, more power, better response, and more refined.

964 RS (and RS variants): The lightweight, track-focused variant. Stripped interior, thinner glass, aluminium bonnet and doors, stiffer suspension, and a 260bhp engine tune. The RS is the most visceral 964 driving experience and commands significant premiums. The RS America (US market) is a different, less extreme specification.

Buy recommendation: For a first air-cooled 911, the 964 Carrera 2 manual coupe is the smart buy. It’s the most affordable entry point into the air-cooled world, and it’s a brilliant car in its own right.

993 Range (1994-1998)

993 Carrera: Rear-wheel drive, 3.6-litre M64 flat-six with VarioRam variable intake, 272bhp. Coil spring rear suspension with LSA (lightweight, stable, agile) multi-link design. The standard 993 Carrera is already a significant step up from the 964, smoother, quieter, more refined, but still unmistakably a 911.

993 Carrera S: The wide-body Carrera, the Turbo body shell with the naturally aspirated engine. Wider rear arches, Turbo brakes, and a more aggressive stance. The S is the sweet spot of the 993 range for many buyers, the Turbo’s looks without the Turbo’s maintenance demands.

993 Carrera 4 / Carrera 4S: All-wheel drive variants with a revised (simpler, lighter) AWD system compared to the 964 C4. The 993 C4S, wide-body, AWD, naturally aspirated, is one of the most desirable 993 configurations.

993 Turbo: Twin-turbocharged 3.6-litre flat-six producing 408bhp. All-wheel drive. The 993 Turbo is one of the great supercars of the 1990s, devastatingly fast, surprisingly refined, and the last air-cooled Turbo 911. Values are stratospheric.

993 GT2: The homologation special, rear-wheel drive (no AWD), twin-turbo, 430bhp (450bhp in later “Evo” form). Stripped, lightened, and built for racing. The rarest and most valuable 993 variant. Current values exceed $2 million AUD.

993 Targa: The 993 Targa featured a unique sliding glass roof panel, a departure from the earlier lift-out panel design. It’s a distinctive look that divides opinion. Less desirable than the coupe but offers a different open-air experience.

Buy recommendation: The 993 Carrera manual coupe is the entry point. The Carrera S is the one most enthusiasts want, wide body, naturally aspirated simplicity, and stunning looks.

What to Look For

Engine, The Critical Systems

The air-cooled flat-six is the heart of both cars, and engine problems are the most expensive issues you’ll face. A full engine rebuild on a 964/993 costs $20,000-40,000 AUD.

Oil System Health (Both 964 and 993): The air-cooled flat-six is entirely dependent on its oil system for both lubrication and significant cooling. Oil health is paramount.

• Check oil level and condition: Pull the dipstick. Oil should be at the correct level and not black. Brown or honey-coloured is normal. Black sludge indicates neglected maintenance. Greyish or milky oil suggests water contamination.
• Ask for oil change records: These engines need oil changes every 5,000 km with high-quality oil (Mobil 1 0W-40 or equivalent). Extended oil change intervals are the primary cause of premature engine wear.
• Check for oil leaks: Look at the engine from below. Some seepage from gasket faces is normal on an air-cooled engine. Active dripping from the cylinder base gaskets, case halves, or cam chain housing is a concern.

964-Specific Engine Issues:

• Dual-row timing chain housing (oil leak): The 964 M64 engine has a dual-row timing chain with a housing that is prone to oil leaks. The gasket between the chain housing and the engine case seeps oil, this is extremely common and ranges from a minor weep (acceptable) to an active drip (needs repair). The repair requires engine removal: $4,000-8,000.
• Hydraulic chain tensioners, the “plastic tensioner” issue (early 964s): Early 964 engines (1989-1991 approximately) had hydraulic chain tensioner guides made of a plastic material that could fail, allowing the timing chain to slip. Updated tensioner guides are available. If the car hasn’t had the tensioner update, factor this in, it requires engine removal. Cost: $3,000-6,000.
• Camshaft oil seals: Leaking camshaft seals are common and require the removal of the camshaft chain covers to access. Typically done during a chain tensioner update or major service.
• Dropped valve guide: If the engine is overheated (even briefly), the aluminium cylinder heads can release a valve guide. The valve drops into the cylinder and destroys the piston, head, and often the barrel. This is an engine-out, $15,000-30,000 failure. Never overheat these engines.

993-Specific Engine Issues:

• VarioRam vacuum leaks: The 993’s VarioRam variable-length intake manifold uses vacuum-operated actuators. The vacuum lines deteriorate and leak, causing the VarioRam system to malfunction. Symptoms: rough idle, loss of power at low rpm, check engine light. Fix: replace vacuum lines ($200-500) or VarioRam actuators ($500-1,500).
• Dual-mass flywheel failure: The 993 uses a dual-mass flywheel that dampens driveline vibrations. These fail, symptoms include a rattling noise from the bellhousing area at idle that disappears when the clutch is depressed. Replacement: $3,000-5,000 (flywheel plus labour; requires gearbox removal).
• Rear main seal leaks: Common on higher-mileage 993s. Oil leak from the rear of the engine at the gearbox input shaft seal. Requires gearbox removal. $2,000-4,000.

Gearbox

Manual (G50, 964, G50/20, 993): The Getrag G50 gearbox is robust. Check for smooth engagement on all gears, no crunching on downshifts, and no whining. The G50 uses the “Wevo” shift linkage (aftermarket upgrade) in many cars, this improves shift feel significantly.

Tiptronic (964 and 993): The Tiptronic automatic gearbox is unreliable and expensive to rebuild. Early 964 Tiptronics are particularly troublesome. If you’re buying a Tiptronic, budget for a potential gearbox rebuild ($8,000-15,000). Manual cars are always more desirable and more valuable.

Suspension

964: Coil spring suspension front and rear, a significant departure from the torsion bars used on all previous 911s. Check for worn dampers (bouncy ride, poor body control), leaking struts, and worn control arm bushings.

993: Multi-link rear suspension (LSA), more sophisticated than the 964’s semi-trailing arm design. Check for worn bushings in the rear suspension arms (multiple arms per side). The self-levelling rear suspension (if fitted, typically on Turbo and some C4 models) uses hydraulic accumulators that fail expensively, replacement costs $3,000-6,000.

Body and Rust

Both 964 and 993 have galvanised bodies and are well-protected from corrosion. However, they’re not immune:

• 964: Check the front bumper support structure (rust behind the bumper cover). Check the battery box area. Inspect the front luggage compartment floor, water can accumulate from blocked drains.
• 993: Generally better protected than the 964. Check the same areas plus the rear quarter panel seams (stone chip damage can lead to corrosion).
• Both: Accident damage is the bigger concern than rust. Look for misaligned panels, paint colour differences between panels, and overspray in door jambs and under the boot lid. A paint depth gauge is essential.

Interior

• Leather condition: Check the bolsters on the driver’s seat, these wear first. Cracked or torn bolsters indicate high mileage or harsh use.
• Dashboard: The 964 dashboard can warp in heat. The 993 dashboard is more resilient.
• Electricals: Test everything, windows, mirrors, seats, climate control, rear wiper, all lights. Porsche electrical components are expensive to replace.

Price Guide (2026 AUD)

964

Condition	C2 Manual	C4 Manual	Turbo 3.3	Turbo 3.6	RS
Needs work	$90,000-120,000	$80,000-110,000	$180,000-220,000	$280,000-350,000	$350,000+
Clean driver	$120,000-170,000	$110,000-150,000	$220,000-300,000	$350,000-450,000	$500,000+
Excellent	$170,000-230,000	$150,000-200,000	$300,000-400,000	$450,000+	$650,000+

993

Condition	Carrera Manual	Carrera S	C4S	Turbo	GT2
Needs work	$140,000-180,000	$170,000-220,000	$180,000-230,000	$280,000-350,000	,
Clean driver	$180,000-250,000	$220,000-300,000	$230,000-320,000	$350,000-450,000	,
Excellent	$250,000-350,000	$300,000-400,000	$320,000-430,000	$450,000+	$2,000,000+

Tiptronic models are typically 15-25% less than manual equivalents. Cabriolets are typically 10-15% less than coupes.

Running Costs

• Annual service (oil change, filters, inspection): $1,000-2,000
• Major service (30,000 km, valve adjustment, belts, fluids): $3,000-6,000
• Insurance: Agreed-value essential. $3,000-8,000/year depending on value.
• Tyres: $350-600 each (225/40R18 front, 265/35R18 rear typical for 993)
• Unexpected repairs: Budget $5,000-10,000/year. These are complex cars.
• Specialist labour: $150-220/hour at a Porsche specialist
• Engine rebuild (if needed): $20,000-40,000

Final Advice

Buying a 964 or 993 is a significant financial commitment, and the margin between a well-maintained car and a money pit is enormous. Pre-purchase inspection by an independent Porsche specialist is non-negotiable. This means engine compression and leak-down testing, bore scope inspection, a thorough underside examination, and a complete systems check. Budget $500-1,000 for this inspection, it will save you tens of thousands.

Buy the best car you can afford with the most complete service history. A 964 or 993 that has been serviced every 5,000 km at a reputable specialist, with receipts to prove it, is worth significantly more than an identical-looking car with gaps in its records. The service history IS the car.

For a first purchase, the 964 C2 manual coupe represents the best entry point. It’s the most affordable air-cooled 911 that’s modern enough to drive confidently, and it establishes whether the air-cooled 911 experience is what you’re looking for. If it is, and it almost certainly will be, you can always trade up to a 993.