Kenworth · Class 8 long-hood conventional tractor
Kenworth W990PACCAR MX-13 12.9L (standard), Cummins X15 15.0L (optional)
Built 2019-2026
Engine PACCAR MX-13 12.9L (standard), Cummins X15 15.0L (optional)
Sources checked 117 of 131 (89%)
What it is
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.
Pick a folder
Fluids & Fill Amounts5 entriesBolt Tightness51 entriesWhen to Service12 entriesWarning Lights & Codes30 entriesHow to Fix It77 entries
The truck itself
Engine options
PACCAR MX-13 12.9L (standard), Cummins X15 15.0L (optional)
Horsepower
405-510 hp (MX-13); 450-605 hp (X15)
Peak torque
1,450-1,850 lb-ft (MX-13); 1,650-2,050 lb-ft (X15)
BBC
131.5 in
Cab
76-in mid-roof, 52-in mid-roof, or 40-in flat top sleeper
Transmission
PACCAR TX-12 12-speed automated (standard); Eaton Fuller manual or automated; Allison automatic
Front axle
Dana Spicer 12k-13.3k
Rear axle
PACCAR 40k tandem (up to 52k; tridem up to 78k)
Weight class
Class 8 - 40,000-52,000 lb tandem rear; up to 78,000 lb tridem
Before you order anything
Options change the numbers
The W990 was introduced in 2019 as the successor to the W900L. It shares the PACCAR powertrain with the T680 but in a longer, more premium package. The W900 is being phased out — the W990 is the future of the Kenworth long-hood line.