2018 GMC Sierra 2500 6.6L Diesel 5th Wheel Puller
Currently using AMSOIL 75/90 Gear Oil in front and read diffs
Also protecting engine with AMSOIL Diesel Injector Cleaner
Owner, Larry, Ret. Air Force Vet, plans on changing oil to
AMSOIL Signature 15/40 and using Signature Fuel-Efficint
ATF for best protection ever!!
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