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Class 8 · On-Highway Tractors

TorqueLibrary32 trucks, 79 procedures, 33 wiring diagrams. Every number carries the years it applies to.

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Freightliner · 2018–2026
Cascadia 126
The most common long-haul tractor in North America. The 126 is the longer-cab version with more room behind the seat.
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Kenworth · 2013–2026
T680
Kenworth's aerodynamic long-haul tractor. Usually ordered with the in-house PACCAR MX-13 engine and a PACCAR automated transmission.
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Peterbilt · 2013–2026
Model 579
Peterbilt's long-haul tractor, built on the same PACCAR engine and axle package as the Kenworth T680, so the service numbers are close to identical.
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Volvo · 2018–2026
VNL 760 / 860
Volvo's long-haul tractor with the I-Shift automated transmission. Oil capacity depends on which oil pan the engine has, so check before ordering oil.
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International · 2017–2026
LT625
Navistar's long-haul tractor. The in-house A26 engine replaced the troubled MaxxForce family and is known for long oil-change intervals when oil sampling is used.
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Mack · 2018–2026
Anthem 64T
Mack's highway tractor, built around the MP8 engine and the mDRIVE automated transmission. Mack publishes a fairly short 25,000-mile highway oil interval.
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Western Star · 2023–2026
57X
Western Star's long-haul truck, introduced for 2023. It uses the same Detroit engines and DT12 transmission as the Freightliner Cascadia, so engine service data matches.
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Kenworth · 2010–2026
W900L
The classic long-nose Kenworth, still popular with owner-operators and heavy haul. Often ordered with the Cummins X15.
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Peterbilt · 2007–2025
Model 389
Peterbilt's long-nose classic, the traditional counterpart to the Kenworth W900. The same Cummins X15 service data applies.
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Freightliner · 2013–2026
122SD
Freightliner's heavy vocational and severe-duty conventional, used for heavy haul, construction and oilfield work. It shares the Detroit DD engine family with the Cascadia.
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Freightliner · 2008–2017
Cascadia 116 (1st Gen)
The first-generation Cascadia, Freightliner's flagship aero tractor from 2008. The 116-inch BBC version is the shorter cab, popular for regional and LTL work.
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Freightliner · 2000–2013
Columbia CL120
The workhorse fleet tractor of the 2000s. Replaced the Century Class and was itself replaced by the Cascadia. Most were ordered with the Detroit Series 60.
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Freightliner · 2002–2017
Coronado
Freightliner's premium long-nose conventional. Chrome, big radiator, big engines — the owner-operator's Freightliner. Built alongside the Cascadia for customers who wanted traditional styling.
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Freightliner · 2000–2007
Century Class C120
The predecessor to the Columbia. The Century Class was Freightliner's main aero highway tractor through the early 2000s. Many are still in fleet service.
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Freightliner · 2000–2010
FLD120 / Classic
The old-school long-nose Freightliner. Built on the Century chassis but with a traditional hood and grille. Popular with owner-operators who wanted a classic look.
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Kenworth · 2000–2010
T2000
Kenworth's first truly aerodynamic long-haul tractor. Introduced in 1996, it set the template for every aero Kenworth that followed. Most were ordered with the Cummins ISX or Detroit Series 60.
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Kenworth · 2007–2017
T660
The T660 bridged the gap between the aging T2000 and the newer T680. It carried the aero styling forward with improved lighting, aerodynamics and driver comfort. Over 60,000 were sold in ten years.
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Kenworth · 2000–2026
T800
The T800 is Kenworth's vocational workhorse — set-back steer axle, heavy frame, and the ability to carry the biggest engines and the heaviest loads. It does everything from logging to heavy-haul to dump work.
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Kenworth · 2019–2026
W990
Kenworth's flagship. The W990 takes the classic W900 long-hood shape and modernises the engineering — 131.5 inches from bumper to back of cab, premium interior, and the full PACCAR integrated powertrain.
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Mack · 2000–2007
Vision CXN613
Mack's first purpose-built aerodynamic highway tractor. Powered by the legendary E7 12-liter, it was the predecessor to the Pinnacle and competed with the Kenworth T660 and Freightliner Century.
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Mack · 2006–2020
Pinnacle CXU
Mack's highway flagship from 2006 to 2020. The Pinnacle replaced the Vision and carried the new MP engine family. Available in axle-back and axle-forward configurations with the mDRIVE automated manual.
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International · 2007–2017
ProStar
International's aerodynamic flagship from 2007 to 2017. The ProStar was designed for fuel economy and driver comfort. Engine options included the MaxxForce 13, Cummins ISX (up to 600 hp), and the Cat C13.
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International · 2009–2026
LoneStar
International's premium long-nose conventional, introduced in 2009 with retro styling. Originally powered by the MaxxForce 13; from 2017 it switched to the redesigned A26 and the optional Cummins X15.
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Western Star · 2000–2026
4900
Western Star's flagship vocational truck. Set-forward, set-back, and extreme-duty configurations. The 4900 handles everything from logging to heavy-haul to dump work, with up to a 1,875 sq in radiator and 600 hp.
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Western Star · 2015–2026
5700XE
Western Star's on-highway aerodynamic tractor, introduced in 2015. The 5700XE brought highway aerodynamics to the Western Star line, powered by the Detroit DD15 and the DT12 automated transmission.
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Peterbilt · 2000–2007
Model 379
The classic long-nose Peterbilt — the most recognisable truck in America. The 379 was produced from 1986 through 2007 and was the flagship owner-operator truck of its era. Many remain in service and in glider kits.
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Peterbilt · 2006–2018
Model 387
Peterbilt's aerodynamic highway tractor from 2006 to 2018. The 387 was the aero counterpart to the 379, with improved aerodynamics and driver comfort. It was replaced by the 579 in 7+ years of production.
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Peterbilt · 2013–2025
Model 567
Peterbilt's vocational and heavy-haul platform, introduced in 2013. The 567 replaced the 367 and 378, and is built for dump, logging, heavy-haul, and other vocational work. Available with set-back or set-forward steer axles.
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Peterbilt · 2025–2026
Model 589
Peterbilt's new flagship long-hood conventional, introduced for 2025 as the successor to the 389. The 589 takes the classic 389 shape and modernises the engineering — new cab interior, LED lighting, updated chassis, and the full PACCAR integrated powertrain.
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Volvo · 2010–2025
VNL 670
Volvo's flagship wide-body sleeper tractor for the 2010s. The 670 has a 70-inch sleeper and the Volvo I-Shift automated transmission. Powered by the Volvo D13 12.8L, which is one of the most reliable and fuel-efficient Class 8 engines of its era.
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Volvo · 2010–2025
VNL 780
Volvo's premium long-haul flagship with the 77-inch sleeper. The 780 is the top-tier Volvo VNL model, built for owner-operators and premium fleets. Powered by the D13 or the D16 for heavy-haul applications.
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Volvo · 2000–2026
VNM
Volvo's set-back-front-axle vocational tractor. The VNM is the vocational sibling to the VNL, with a set-back steer axle for a tighter turning radius and a heavier frame for vocational work. Used for regional, dump, and heavy-haul duty.
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Or go straight to a system

Fluids & Fill AmountsHow much oil, coolant, DEF and gear oil each truck holdsBolt TightnessTorque numbers for the important fasteners, plus tire pressuresWhen to ServiceHow often to change oil, filters and coolantWarning Lights & CodesWhat a fault code means and what to check firstHow to Fix ItStep-by-step remove-and-replace procedures

For the shop floor

Shop floor
Remove & Replace Sheets
One job per page, with torque printed beside the step, and a line to sign.
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Plain English
Words Explained
What DEF, DPF, regen, torque, SPN and the rest of the jargon actually mean.
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The ten trucks in this library

TruckYearsEngineOpen
Freightliner Cascadia 1262018-2026Detroit DD15 Gen 5, 14.8 L (DD13 Gen 5 12.8 L also offered)open
Kenworth T6802013-2026PACCAR MX-13, 12.9 L (MX-11 10.8 L and Cummins X15 optional)open
Peterbilt Model 5792013-2026PACCAR MX-13, 12.9 L (MX-11 10.8 L, Cummins X15 optional)open
Volvo VNL 760 / 8602018-2026Volvo D13 Turbo Compound (standard) or D13 VGT, 12.8 Lopen
International LT6252017-2026International A26, 12.4 L (Cummins X15 optional)open
Mack Anthem 64T2018-2026Mack MP8, 12.8 L / 13.0 Lopen
Western Star 57X2023-2026Detroit DD15 Gen 5 14.8 L (DD13 Gen 5, DD16 optional)open
Kenworth W900L2010-2026Cummins X15, 15.0 L (PACCAR MX-13 optional)open
Peterbilt Model 3892007-2025Cummins X15, 15.0 L (PACCAR MX-13 optional)open
Freightliner 122SD2013-2026Detroit DD13 or DD16 (Cummins X15 optional)open
Freightliner Cascadia 116 (1st Gen)2008-2017Detroit DD15 or DD13 (MBE 4000 on early models)open
Freightliner Columbia CL1202000-2013Detroit Series 60 12.7L/14L, MBE 4000, Cat C15, Cummins ISXopen
Freightliner Coronado2002-2017Detroit Series 60 / DD15, Cummins ISX, Cat C15/C16open
Freightliner Century Class C1202000-2007Detroit Series 60 12.7L/14L, Cat C15, Cummins ISXopen
Freightliner FLD120 / Classic2000-2010Detroit Series 60 12.7L/14L, Cat C15open
Kenworth T20002000-2010Cummins ISX 14.9L, Detroit Series 60 12.7/14L, Cat C15 15.2Lopen
Kenworth T6602007-2017PACCAR MX-13 12.9L (standard), Cummins ISX, Cat C15open
Kenworth T8002000-2026PACCAR MX-13 12.9L, Cummins X15 15.0L (also ISX pre-2017)open
Kenworth W9902019-2026PACCAR MX-13 12.9L (standard), Cummins X15 15.0L (optional)open
Mack Vision CXN6132000-2007Mack E7 12.0L, later ASET AI/AMI (EPA2004+)open
Mack Pinnacle CXU2006-2020Mack MP8 12.8L, MP7 11Lopen
International ProStar2007-2017International MaxxForce 13, Cummins ISX, Cat C13open
International LoneStar2009-2026International A26 12.4L (from 2017), Cummins X15 (from 2017), MaxxForce 13 (2009-2016)open
Western Star 49002000-2026Detroit DD13/DD15/DD16, Cummins ISX/X15, Detroit Series 60 (legacy)open
Western Star 5700XE2015-2026Detroit DD15 14.8L (standard), Cummins ISX/X15 15.0Lopen
Peterbilt Model 3792000-2007Detroit Series 60 12.7L/14L, Cat C15 15.2L, Cummins ISX 14.9Lopen
Peterbilt Model 3872006-2018PACCAR MX-13 12.9L (2010+), Cummins ISX 14.9L, Cat C15 15.2Lopen
Peterbilt Model 5672013-2025PACCAR MX-13 12.9L, Cummins X15 15.0Lopen
Peterbilt Model 5892025-2026PACCAR MX-13 12.9L (standard), Cummins X15 15.0L (optional)open
Volvo VNL 6702010-2025Volvo D13 12.8L (standard), Volvo D11 10.8Lopen
Volvo VNL 7802010-2025Volvo D13 12.8L, Volvo D16 16.1L (heavy-haul)open
Volvo VNM2000-2026Volvo D13 12.8L, Volvo D16 16.1L (heavy-haul), Cummins ISX/X15open
TorqueLibrary — A research compilation, not an OEM manual. Green means published and traceable; amber means second-hand, so check it. Where nothing was published the page says so rather than guessing.
Built from OEM operator manuals, federal service bulletins and industry standards (SAE, TMC, Bendix, Michelin, ConMet, Accuride). Confirm every number against the manual for your specific VIN before you turn a wrench.