2020 GMC Sierra 1500 SLT

  • Used
  • Diesel
Vehicle Price
$29,882
Doc Fee
$695
Mastria Total Price
$30,577
Finance Terms
Mastria Subaru
Location Details
Call 617-701-9456
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    The overview

    Exterior Color
    Satin Steel
    Interior Color
    Jet Black
    Odometer
    95,357 miles
    Fuel Economy
    16/22 MPG City/Hwy
    Transmission
    10-Speed Automatic
    Drivetrain
    4x4
    Engine
    I-6 cyl
    VIN
    3GTU9DET6LG248495
    Stock Number
    G6420A
    • Show Me the CARFAX Badge

    The highlights

    • Leather upholstery
    • Automatic temperature control
    • Premium audio system
    • Wireless phone connectivity
    • Front dual zone A/C
    • Auto-dimming rearview mirror
    • Split folding rear seat
    • Memory seat
    • Heated front seats
    • Perimeter/approach lights
    • Remote keyless entry
    • Heated steering wheel
    • 1-touch down
    • 1-touch up
    • Air conditioning
    • Auto-dimming rearview mirror
    • Automatic temperature control
    • Driver door bin
    • Driver vanity mirror
    • Front beverage holders
    • Front dual zone A/C
    • Heated steering wheel
    • Illuminated entry
    • Memory seat
    • Overhead console
    • Passenger door bin
    • Passenger vanity mirror
    • Power windows
    • Proximity key: doors and push button start
    • Rear beverage holders
    • Rear door bins
    • Remote engine start: keyfob
    • Remote keyless entry
    • Speed control
    • Telescoping steering wheel
    • Tilt steering wheel
    • Alloy wheels
    • Front anti-roll bar
    • Front wheel independent suspension
    • Power steering
    • Speed-sensing steering
    • 1st row LCD monitors: 2
    • AM/FM radio: SiriusXM with 360L
    • Premium audio system: Premium GMC Infotainment System
    • Primary LCD size: 8.0"
    • Radio data system
    • Smart device integration: Apple CarPlay/Android Auto
    • Steering wheel mounted audio controls
    • Wireless phone connectivity: Bluetooth
    • Heated front seats
    • Leather upholstery
    • Power 2-way driver lumbar support
    • Power 2-way passenger lumbar support
    • Power driver seat
    • Power passenger seat
    • Rear seat center armrest
    • Rear seats: split-bench
    • Rear seats Folding position: fold-up cushion
    • Seat Upholstery: leather
    • Split folding rear seat
    • Cylinder deactivation
    • Drive type: four-wheel
    • Engine location: front
    • Fuel economy city: 16mpg
    • Fuel economy combined: 19mpg
    • Fuel economy fuel type: gasoline
    • Fuel economy highway: 22mpg
    • Fuel tank capacity: 24.0gal.
    • Hybrid traction battery type: none
    • Manual-shift auto
    • Mode select transmission
    • Rear locking differential
    • Transmission: 10 speed automatic
    • Variable valve control
    • Ground clearance (min): 202mm (8.0")
    • Auto-dimming door mirrors
    • Bumpers: chrome
    • Door mirrors: chrome
    • Heated door mirrors
    • Left rear passenger door: conventional
    • Power door mirrors
    • Rear cargo: tailgate
    • Rear step bumper
    • Right rear passenger: conventional
    • Trailer hitch receiver
    • Trailer sway control
    • Exterior body width: 2,063mm (81.2")
    • Exterior height: 1,915mm (75.4")
    • Exterior length: 6,126mm (241.2")
    • Front headroom: 1,093mm (43.0")
    • Front hiproom: 1,554mm (61.2")
    • Front legroom: 1,131mm (44.5")
    • Front shoulder room: 1,677mm (66.0")
    • Rear headroom: 1,019mm (40.1")
    • Rear hiproom: 1,530mm (60.2")
    • Rear legroom: 1,102mm (43.4")
    • Rear shoulder room: 1,655mm (65.2")
    • Wheelbase: 3,988mm (157.0")
    • Appearance: analog
    • Compass
    • Delay-off headlights
    • Front fog lights
    • Front reading lights
    • Fully automatic headlights
    • Low tire pressure warning
    • Oil pressure gauge
    • Outside temperature display
    • Rear reading lights
    • Rear window defroster
    • Tachometer
    • Trip computer
    • Variably intermittent wipers
    • Voltmeter
    • 4 wheel disc brakes
    • ABS brakes
    • Brake assist
    • Dual front impact airbags
    • Dual front side impact airbags
    • Electronic stability
    • Ignition disable
    • Occupant sensing airbag
    • Overhead airbag
    • Panic alarm
    • Perimeter/approach lights
    • Security system
    • Traction control
    This 2020 GMC Sierra 1500 SLT delivers premium capability wrapped in professional styling. The gray exterior and jet black leather interior create a refined appearance, while the turbocharged 3.0L diesel engine paired with a 10-speed automatic transmission and 4WD ensures confident performance on any terrain. With EPA-estimated 22 city / 26 highway MPG, actual mileage may vary. This crew cab standard bed configuration balances passenger comfort with practical utility.

    - 161-Point Multi Service Inspection
    - Fully Serviced & White Gloved Detailed
    - Power Sunroof
    - SLT Premium Plus Package
    - Engine Block Heater
    - Heated Front Seats
    - Premium GMC Infotainment System with Navigation
    - Apple CarPlay and Android Auto
    - ProGrade Trailering System
    - Adaptive Cruise Control

    The Sierra has been meticulously detailed and inspected to ensure every system operates as intended. You're purchasing a thoroughly serviced truck ready for work or weekend adventures.

    This well-maintained Sierra 1500 SLT represents excellent value for buyers seeking a capable diesel truck with modern conveniences and proven reliability. Schedule your test drive today and experience why GMC owners choose quality and performance.

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    Vehicle history report

    • Title information
    • Odometer readings
    • Accident data (if applicable)
    • Service history
    • Vehicle usage
    • Recall information (if applicable)
    • Warranty status
    Free CarFax report

    A name you can trust

    Mastria Subaru is dedicated to your satisfaction before, during, and after your purchase. We'll go the extra mile to take care of you.
    More about us

    KBB.com Consumer Reviews

    Kelley Blue Book Logo4.0out of 5 overall
    • 4.0

      Depreciation of 50%

      by Manny A on 10/28/2026 10:06:36 AM

      This is a amazing truck.. Comfortable lots of sensors Etc…. My truck has 30000 miles I when to trade in they offer $46000 I paid $86000 the depreciation is incredible I don’t buy new truck never again.…
    • 5.0

      2021 GMC SLT 4WD SIERRA, Great Truck

      by Ransom1 on 10/15/2026 4:18:42 PM

      This is my 8th truck. This is hands down the very best truck I’ve ever owned. Not only is it the best looking truck on the road I have never had it in the shop except for oil changes and scheduled maintenance. The silver does not show dirt or grime.…
    • 5.0

      Great 4 cylinder truck

      by Steve on 9/23/2026 2:01:15 AM

      I have only pulled a trailer one time and still got 18 mpg down doing 80 down the interstate. Otherwise this vehicle is used for commuting or recreating. I typically get 22-24 mpg driving MT highways to the mountains. The turbo has some spunk for getting up to speed and the five years I've had my truck no complaints.…
    All reviews on KBB.com
    Based on 71 consumer ratings for 2019–2026 models. Privacy
      With approved credit. All offers to qualified buyers and prices are subject to change without prior knowledge. Prior sales excluded. Leases based on 10k miles per year and for 36 months. Must take delivery in dealer stock. All vehicles exclude cost of any equipped accessories. Tax, title, doc fee, destination, reg. fee, acq. fee, and dealer fees additional.  Extra charges may apply at lease end. Select models/trims. See dealer for full details
      *Prices do not include additional fees and costs of closing, including government fees and taxes, any finance charges, $695.00 dealer documentation fees, any emissions testing fees or other fees.
      Massachusetts Subaru Dealership, Mastria Subaru, has an extensive inventory of used Subaru vehicles for sale. We are conveniently located off of Route 24, on the Route 44 Automile. Serving Norwood, Bourne, Hanover, Somerset, Raynham, Fall River & Taunton, MA and Providence Rhode Island. Stop by and take a test drive today!

      Mastria Subaru | 1255 New State Highway, Raynham, MA 02767 | Sales: (508) 593-1891