Chevy 2500 6.6L L8T V8 Review | GM’s MOST RELIABLE Engine They Still Build

HD Mechanics Review of the 2025 Chevy 2500 6.6L L8T Gas V8 Engine, I go engine design, specs, performance, benefits and negatives comparing to other HD gas engine in the segment! **Get 25% Off all AMSOIL Products**, Sign up as one of my preferred customers here! 👉https://www.amsoil.com/offers/pc/?zo=31309211 Your first order pays for the membership! Get 10% Off all MBRP Products 👉 https://www.mbrp.com/?ref=vhkkklci **Use code "GETTYGARAGE" to get 10% off!** *GET 10% OFF Weigh Safe Hitches* 👉https://crrnt.app/WEIG/3475nWnl Or use Code "Gettys10" at checkout! Connect with me on Social Media: Instagram: https://www.instagram.com/thegettygarage/ Tik Tok: https://www.tiktok.com/@thegettyadventures What I Use: 6.4L HEMI AMSOIL Engine Oil - https://www.amsoil.com/lookup/auto-and-light-truck/2022/ram/2500-pickup/6-4l-8-cyl-engine-code-j-esb-j/?zo=31309211 WIX Engine Oil Filter - https://www.amsoil.com/p/wix-oil-filter-wixoil/?code=57060-EA&_gl=1*1nha42k*_up*MQ..*_ga*MTgxMTYzNzYwNi4xNzQ3MzM4Nzgz*_ga_E8P3KK8JV8*czE3NDczMzg3ODIkbzEkZzEkdDE3NDczMzg4MDUkajAkbDAkaDEwMjA1MDcyMDc.?zo=31309211 WIX Engine Air Filter - https://www.amsoil.com/p/wix-air-filter-wixair/?code=46930-EA&_gl=1*h9vgr7*_up*MQ..*_ga*MjAzNTkzNzEyLjE3NDczMzgyMDA.*_ga_E8P3KK8JV8*czE3NDczMzgxOTkkbzEkZzAkdDE3NDczMzgxOTkkajAkbDAkaDY0ODQzNDY3OA..?zo=31309211 Cabin Air Filter - https://amzn.to/3JMZAHh Gear Oil - https://www.amsoil.com/p/amsoil-severe-gear-75w-90-100-synthetic-gear-lube-svg/?_gl=1*it5o9x*_up*MQ..*_ga*NDgxNjkwMDUxLjE3NDc0MDExNzQ.*_ga_E8P3KK8JV8*czE3NDc0MDExNzMkbzEkZzEkdDE3NDc0MDExODQkajAkbDAkaDE1NTc0MzUzOTE.?zo=31309211 Grease - https://www.amsoil.com/p/amsoil-100-synthetic-multi-purpose-grease-glc/?code=glccr-ea&_gl=1*hp8cr9*_up*MQ..*_ga*MjAzNjEzODc5Ny4xNzQ3NDAxNDg3*_ga_E8P3KK8JV8*czE3NDc0MDE0ODYkbzEkZzAkdDE3NDc0MDE0ODYkajAkbDAkaDU5NTEyMTc4NA..https://www.amsoil.com/p/amsoil-heavy-duty-metal-protector-amhsc/?code=amhsc-ea&_gl=1*10x1frk*_up*MQ..*_ga*MTkzMjMyOTA3OC4xNzQ3MzM5MTQz*_ga_E8P3KK8JV8*czE3NDczMzkxNDIkbzEkZzAkdDE3NDczMzkxNDIkajAkbDAkaDE4OTQwMDEyNDg.?zo=31309211 Rust protection - https://www.amsoil.com/p/amsoil-heavy-duty-metal-protector-amhsc/?code=amhsc-ea&_gl=1*10x1frk*_up*MQ..*_ga*MTkzMjMyOTA3OC4xNzQ3MzM5MTQz*_ga_E8P3KK8JV8*czE3NDczMzkxNDIkbzEkZzAkdDE3NDczMzkxNDIkajAkbDAkaDE4OTQwMDEyNDg.?zo=31309211 What I Use: 7.3L POWERSTROKE Engine Oil - https://amzn.to/3ZLIWBD Engine Oil Filter - https://amzn.to/4gHTwRb Fuel Filter - https://www.amsoil.com/p/wix-fuel-filters-wixfuel/?code=33817-EA&_gl=1*hx3uv5*_up*MQ..*_ga*MTQxMzc5MjkxMS4xNzQ3NDAxOTA0*_ga_E8P3KK8JV8*czE3NDc0MDE5MDMkbzEkZzAkdDE3NDc0MDE5MDMkajAkbDAkaDMyMzA0OTY2OQ..?zo=31309211 Gear Oil - https://www.amsoil.com/p/amsoil-severe-gear-75w-85-100-synthetic-gear-lube-svl/?code=SVLPK-EA&_gl=1*hka7u4*_up*MQ..*_ga*MTY5MjU2MjE4Ny4xNzQ3NDAxNzM2*_ga_E8P3KK8JV8*czE3NDc0MDE3MzUkbzEkZzAkdDE3NDc0MDE3MzUkajAkbDAkaDI5MTA4ODEwNQ..?zo=31309211 Grease - https://www.amsoil.com/p/amsoil-100-synthetic-multi-purpose-grease-glc/?code=glccr-ea&_gl=1*hp8cr9*_up*MQ..*_ga*MjAzNjEzODc5Ny4xNzQ3NDAxNDg3*_ga_E8P3KK8JV8*czE3NDc0MDE0ODYkbzEkZzAkdDE3NDc0MDE0ODYkajAkbDAkaDU5NTEyMTc4NA..https://www.amsoil.com/p/amsoil-heavy-duty-metal-protector-amhsc/?code=amhsc-ea&_gl=1*10x1frk*_up*MQ..*_ga*MTkzMjMyOTA3OC4xNzQ3MzM5MTQz*_ga_E8P3KK8JV8*czE3NDczMzkxNDIkbzEkZzAkdDE3NDczMzkxNDIkajAkbDAkaDE4OTQwMDEyNDg.?zo=31309211 Towing Gear: 10 ton Pintle hitch (2.5" receiver) - https://amzn.to/3r7Axvm 7 Ton Adjustable hitch (2" receiver) - https://amzn.to/46i2iAf Adjustable Pintle hitch mount (2.5" receiver) - https://amzn.to/3RqHGS3 15 Ton Pintle hitch - https://amzn.to/45SaCqv 10,000lbs Tie Down Straps - https://amzn.to/3ZBnxeh n this full review, I take a deep dive into the 2025 Chevy Silverado 2500 HD powered by the 6.6-liter L8T gas V8 — GM’s only heavy-duty gasoline engine. I test how this naturally aspirated pushrod V8 performs in real-world driving, towing, and fuel-economy conditions to see if it’s truly GM’s most reliable and overbuilt engine on the market today. We’ll cover everything from its cast-iron block and six-bolt mains to its direct-injection fueling and heavy-duty 10-speed transmission pairing. I also run my standard MPG test loop to find out whether this engine can compete with the Ram 6.4L HEMI and Ford’s 7.3L Godzilla when it comes to efficiency and drivability. If you’re considering a gas HD truck for long-term ownership or fleet work, this review breaks down the pros and cons of the 6.6L L8T versus diesel options, including maintenance costs, oil-change intervals, towing performance, and everyday reliability. The 6.6L may not have the marketing hype of the Duramax, but it just might be GM’s toughest, simplest, and most dependable engine still in production.