BMW M8 vs Porsche Cayenne
A detailed look at how two of Australia's most popular cars compare on price, running costs, safety, and everyday livability.
Specifications and pricing correct at time of publishing. Prices are RRP before on-road costs unless stated otherwise. Always confirm with the manufacturer or dealer before purchasing.
BMW M8
$377,000 when new
RRP when new — this model is no longer sold new in Australia
Gran Coupe
Petrol
Petrol
460kW
10.7 L/100km
ANCAP: no data
440L
Porsche Cayenne
From $138,800
SUV
Petrol
Petrol
260kW
10.4 L/100km
ANCAP: no data
698L
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Price Breakdown
The BMW M8 starts from $377,000 before on-road costs, while the Porsche Cayenne opens at $138,800. That makes the Porsche Cayenne the more affordable entry point by $238,200.
Once you factor in stamp duty, registration, CTP insurance, and dealer delivery, expect to add roughly 8-12% on top of the RRP depending on your state. That puts estimated driveaway prices in the ballpark of $414,700 and $152,680 respectively.
Over 5 years, the running costs are nearly identical since both have similar efficiency.
Safety Rundown
ANCAP safety ratings have not been published for both models yet. We will update this section when crash test results are available.
Feature Showdown
The BMW M8 features a 10.3-inch touchscreen paired with a 12.3-inch digital dash, while the Porsche Cayenne gets a 12.3-inch display and 12.6-inch instruments. Apple CarPlay and Android Auto are standard across both.
The BMW M8 stands out with wireless Apple CarPlay/Android Auto, wireless charging, ventilated seats, Bowers & Wilkins audio and ambient lighting — features our data doesn't list for the Porsche Cayenne. The Porsche Cayenne counters with Apple CarPlay and BOSE audio. Which feature set matters more depends on your daily routine and priorities.
Interior trim differs: the BMW M8 gets merino leather upholstery while the Porsche Cayenne offers leather.
Drivetrain
The BMW M8 uses a Petrol producing 460kW and 750Nm of torque, sent through a auto to a 4WD layout. It covers the 0-100km/h sprint in 3.2 seconds.
The Porsche Cayenne responds with a Petrol making 260kW and 500Nm, paired to a 8-speed auto driving all four wheels. It gets to 100km/h in 6 seconds.
The BMW M8 has the clear power advantage at 460kW vs 260kW. In the 0-100 sprint (manufacturer-claimed), the BMW M8 is 2.8s quicker. For most buyers, the way each car feels day-to-day matters more than outright acceleration.
Space & Comfort
The BMW M8 measures 5,098mm long on a 3,027mm wheelbase, 168mm longer than the Porsche Cayenne at 4,930mm (2,895mm wheelbase). The longer wheelbase on the BMW M8 generally means more rear legroom.
Boot space is 440L in the BMW M8 and 698L in the Porsche Cayenne, giving the Porsche Cayenne a 258L advantage. The Porsche Cayenne seats 5 vs 4.
0Turning Circle
Kerb-to-kerb diameter. Smaller turns easier in tight carparks and U-turns.
11.4m to 12.1m
Based on 11.4m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Based on 12.1m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Turning circle ratings
Compare U-turns side by side
Turning Circle · U-turn compare
kerb-to-kerb, 2 cars0 of 2 clear a 7.0 m street in one sweep
Green cars complete the U-turn; amber need a 3-point turn. Drag the slider to test tighter streets.
Standard widths: AU local streets ~5.5–7 m; main roads ~9–12 m.
True Cost to Own
Based on 15,000km of annual driving, fuel costs roughly $3,050/year for the BMW M8 and $2,964/year for the Porsche Cayenne. That is a $86 annual difference in favour of the Porsche Cayenne.
Warranty: 5 years / 999,999km (BMW M8) vs 3 years / 999,999km (Porsche Cayenne). The BMW M8 has longer coverage.
Who Should Buy Which?
Buy the BMW M8 if: You prioritise performance, value a longer warranty, or prefer BMW's approach to design and ownership experience.
Buy the Porsche Cayenne if: You want the lower entry price, need more boot space, want lower running costs, or prefer Porsche's approach to design and ownership experience.
The Verdict
The Porsche Cayenne takes 4 of 7 key spec categories and comes in at a lower price. The Porsche Cayenne will save you roughly $86 a year in fuel. If boot space matters, the Porsche Cayenne has a clear edge. The BMW M8 adds peace of mind with a longer 5-year warranty. The best pick depends on what you value most. Explore the full specs for each model below.
Common questions
Which is cheapest, BMW M8 and Porsche Cayenne?
The Porsche Cayenne is the cheapest at $138,800 before on-road costs. That undercuts the BMW M8 by $238,200.
Which is the most fuel-efficient?
The Porsche Cayenne uses the least fuel at 10.4L/100km on the combined cycle.
What are the ANCAP safety ratings?
None of BMW M8 and Porsche Cayenne carry a published ANCAP rating yet, so there is no crash result to compare. Check back as they are tested.
Which has the most boot space?
The Porsche Cayenne has the largest boot at 698L.
Which can tow the most?
The Porsche Cayenne has the highest braked towing capacity at 3,500kg.
Which has the best warranty?
The BMW M8 has the longest warranty at 5 years / Unlimited.
Which is the most powerful?
The BMW M8 makes the most power at 460kW. The BMW M8 is quickest to 100km/h in 3.2s.
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Disclaimer: All information in this comparison was believed to be correct at the time of publishing (20 April 2026). Prices are manufacturer recommended retail prices (RRP) and may vary by state, dealer, and options. Driveaway costs include estimated on-road costs for Victoria. Fuel economy figures are WLTP/ADR combined cycle. Specifications can change without notice. Always verify with the manufacturer before making a purchase decision. CarSorted does not accept payment for recommendations.
Auto-generated from CarSorted's specification data · 20 April 2026
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