2018 Audi A4 Lug Nut Torque & Bolt Specs
The 2018 Audi A4 lug nut torque is 89 ft-lbs (121 Nm). Torque in a star pattern in two passes (snug, then final), and re-check after the first 50–100 miles of driving. Use a calibrated torque wrench — not an impact gun — for the final pass.
Lug nut torque: 89 ft-lbs (121 Nm).
This page is the OEM-referenced fastener summary for the 2018 Audi A4. Use it before any maintenance or repair job where torque values matter — brake work, wheel changes, suspension service, engine teardowns, or oil changes. Specs are pulled from manufacturer service literature, cross-checked against community data, and updated as new chassis variants become available.
For the 2018 Audi A4, fasteners follow metric standards typical of late-model Audi engineering. Always confirm spec against the factory service manual before tightening safety-critical fasteners (suspension, brake, steering, head bolts).
Common fastener categories on the 2018 Audi A4
- Wheel / lug nut torque and thread spec (covered above)
- Brake caliper bracket bolts (typically 80-130 ft-lbs) and slide/guide pins (18-35 ft-lbs)
- Engine oil drain plug torque — rarely above 30 ft-lbs; always use a new crush washer
- Transmission pan, valve cover, and intake manifold bolts (low torque, often 89-106 in-lbs)
- Suspension control arm, sway bar, tie rod end and ball joint torque
- Spark plug torque (typically 10-15 ft-lbs on aluminum heads — do not exceed)
- Differential cover bolts (RWD/4WD only) and transfer case fasteners
Repair guidance for this model year
For 2018 model-year work: This era introduced widespread torque-to-yield (TTY) bolts on head, main, and crank pulley fasteners. TTY bolts stretch permanently when torqued and must not be reused — the spec calls for a fresh bolt every time. Always verify TTY status against the FSM before reassembly.
Tools you will need
- Metric socket set (8mm-22mm), 6-point impact-rated
- Calibrated torque wrench (10-150 ft-lbs covers most automotive jobs; add a 0-250 ft-lbs wrench for truck lug nuts)
- Breaker bar (24" minimum) for initial loosening
- Penetrating oil (PB Blaster or Kroil) for any fastener over 5 years old
- Anti-seize on stainless or dissimilar-metal threads; thread-locker (Loctite blue) on critical reassembly
Frequently asked questions
What is the lug nut torque on a 2018 Audi A4?
The OEM-specified lug-nut torque for the 2018 Audi A4 is 89 ft-lbs (121 Nm). Use a calibrated torque wrench in a star pattern, in two passes (50% and 100%), and re-check after 50-100 miles of driving.
What socket size do I need for the 2018 Audi A4 lug nuts?
Most modern Audi vehicles use a 19mm or 21mm socket. Older Audi models from before 2000 may use a 13/16" SAE socket on certain trims. Confirm against the actual lug before purchasing aftermarket wheels.
Are the 2018 Audi A4 fasteners metric or SAE?
Metric is the standard for this vehicle. Most fasteners on this vehicle are metric (M6, M8, M10, M12, M14). Bring a full metric set; SAE substitutes can round the head. Bolt-head markings are the fastest way to confirm grade and material at the bench.
Other Audi A4 years
Same model, different model year — fastener spec may change. Always confirm against the year for your VIN.
→ 2018 Audi A4 oil drain plug torque & size
All 8 2018 Audi A4 fastener specs
Per-bolt torque, wrench size, and thread spec for the 2018 Audi A4, sourced from OEM service literature and verified against community shop data. Values pair imperial (ft-lb) and metric (Nm) where the manufacturer publishes both. 1 of the 8 fastener specs on this page are independently verified against OEM service manuals and manufacturer torque data (last reviewed June 2026).
Wheels — 2018 Audi A4
Wheel and lug nut spec for the 2018 Audi A4. For the all wheels, plan for the right driver; final torque is 89 ft-lbs (121 Nm) (wheel bolt). Confirmed against manufacturer service literature.
Suspension - Front — 2018 Audi A4
Suspension - Front fasteners on the 2018 Audi A4. Front strut mount (upper) tightens to 15 Nm + 90°, takes a N/A driver, runs on M15 threads, located at the suspension - front. The ball joint to control arm uses a 17mm drive on a M10 or M12 thread, torqued to 40 Nm + 45° at the suspension - front.
Engine - Mounts — 2018 Audi A4
Engine - Mounts fasteners on the 2018 Audi A4. The dogbone/pendulum mount uses a 22mm drive on a M14 x 1.5 x 50mm thread, torqued to 130 Nm (96 ft-lbs) at the engine - mounts. At the engine - mounts, the transmission mount to transmission torques to 60 Nm + 90° (19mm drive, M12 thread).
Transmission — 2018 Audi A4
Transmission fasteners on the 2018 Audi A4. At the transmission, the transmission fluid pump cover torques to 8 Nm (6 ft-lbs) (10mm drive, M6 thread). For the transmission, plan for a 10mm tool on a M6 or M8 stud; final torque is 5 Nm + 90° (dsg mechatronic). Dsg drain plug tightens to 45 Nm (33 ft-lbs), takes a 22mm driver, runs on M14 threads, located at the transmission.
New to torquing wheels? Read our How lug nut torque works — the complete guide for star-pattern sequence, re-torque intervals, and how to read a lug spec — then use the 2018 Audi A4 numbers above.
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