2014–2018 Chevrolet Impala Bolt Sizes & Torque Specs

Lug nut torque is not verified for this summary. Review the cited evidence and exact hardware application before installation.

This page distinguishes source-backed fields, unresolved conflicts and unverified legacy records for the 2018 Chevrolet Impala. Match the exact hardware and manual conditions before maintenance. A source for one field does not verify the other specifications.

These specifications also apply to the 2014, 2015, 2016 and 2017 model years — identical specs on file for each year.

GM passenger cars, crossovers and trucks use different wheel hardware families, including seat-style differences that matter when buying aftermarket lugs. Match the listed row and the original seat type; do not infer a truck value from a car, or the reverse.

Common fastener categories on the 2018 Chevrolet Impala

Wheel / lug nut torque and thread spec (covered above)
Brake caliper bracket, mounting, and slide/guide-pin bolts are different fasteners. Confirm the exact axle, application and service-manual specification before reassembly.
Engine oil drain plug torque and tool size when this vehicle has a verified drain-plug record
Transmission pan, valve cover, and intake manifold bolts where the database has exact records
Suspension control arm, sway bar, tie rod end and ball joint torque
Spark plug torque only when a vehicle-specific spark-plug row is available
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
Replacement washers, threadlocker, anti-seize, or dry-thread preparation only when the exact service procedure specifies them

Frequently asked questions

What is the lug nut torque on a 2018 Chevrolet Impala?

Specification not verified for this lug nut summary. Do not substitute another model year's value.

What socket size do I need for the 2018 Chevrolet Impala lug nuts?

Confirm the socket against the actual lug nut; no size is assumed here.

Are the 2018 Chevrolet Impala 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 Chevrolet Impala years

Same model, different model year — fastener spec may change. Always confirm against the year for your VIN.

→ 2018 Chevrolet Impala oil drain plug torque & size

All 9 2018 Chevrolet Impala fastener specs

Per-field evidence and legacy records for the 2018 Chevrolet Impala. A verified torque does not verify socket size, thread or part number. Unverified records are not installation instructions; conflicting specifications are withheld.

Wheels — 2018 Chevrolet Impala

Wheel and lug nut spec for the 2018 Chevrolet Impala. Lug Nut (All wheels). Torque: 100 ft-lbs (135 Nm) (legacy record, unverified). Socket size: not verified. Thread: M12x1.5 (legacy record, unverified). Part number: 84639994 (legacy record, unverified).

Engine — 2018 Chevrolet Impala

Engine bolt-by-bolt torque for the 2018 Chevrolet Impala, including the long block, valve covers, and intake. Water Pump Bolt. Torque: 18 ft-lbs (24 Nm) (legacy record, unverified). Socket size: 10mm (legacy record, unverified). Thread: M8x1.25 (legacy record, unverified). Part number: not verified. Engine Mount Bracket Bolt. Torque: 74 ft-lbs (100 Nm) (legacy record, unverified). Socket size: 18mm (legacy record, unverified). Thread: M12x1.5 (legacy record, unverified). Part number: not verified. Oil Drain Plug. Torque: 18 ft-lbs (25 Nm) (legacy record, unverified). Socket size: 15mm (legacy record, unverified). Thread: M12x1.75 (legacy record, unverified). Part number: 55577568 (legacy record, unverified). Spark Plug. Torque: 13 ft-lbs (18 Nm) (legacy record, unverified). Socket size: 16mm (legacy record, unverified). Thread: M14x1.25 (legacy record, unverified). Part number: not verified. Crankshaft Pulley Bolt. Torque: 74 ft-lbs + 150 deg turn (legacy record, unverified). Socket size: 37mm (legacy record, unverified). Thread: M20x1.5 (legacy record, unverified). Part number: not verified. Exhaust Manifold Bolt. Torque: 11 ft-lbs (15 Nm) (legacy record, unverified). Socket size: 13mm (legacy record, unverified). Thread: M8x1.25 (legacy record, unverified). Part number: not verified. Cylinder Head Bolt. Torque: 22 ft-lbs + 155 deg turn (legacy record, unverified). Socket size: 15mm (legacy record, unverified). Thread: M11x1.5 (legacy record, unverified). Part number: not verified.

Suspension — 2018 Chevrolet Impala

Suspension and chassis fastener torque for the 2018 Chevrolet Impala — strut, control arm, and sway bar values. Lower Control Arm Rear Bolt. Torque: 111 ft-lbs (150 Nm) (legacy record, unverified). Socket size: 21mm (legacy record, unverified). Thread: M14x1.5 (legacy record, unverified). Part number: not verified.

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 Chevrolet Impala numbers above.

Loading the interactive 2018 Chevrolet Impala fastener lookup with per-bolt filtering, part links, and torque tools…