Samantha Reed 
If you drive a modern common-rail diesel, you have probably noticed the fuel system is fussier than the old IDI engines your grandfather used to swear by. I have spent the last 90 days testing pour-in additives and workshop-style flushes on three trucks (a 6.7L Cummins, an LBZ Duramax, and a 6.4L Powerstroke), logging idle … Read more
The best diesel exhaust fluid is any API-certified, ISO 22241-compliant DEF that matches your engine’s SCR system. After our team reviewed dozens of DEF brands and talked with owners running 6.7 Powerstroke, L5P Duramax, and 6.7 Cummins engines, ACDelco’s GM Original Equipment 10-4022 took the top spot for its OEM-grade purity and universal SCR compatibility. … Read more
After two months of testing eight top-selling oil additives across a high-mileage pickup, a flat-tappet classic Mustang, and a daily-driver GDI sedan, I can say this with confidence: the best oil additives work when matched to a real problem. Project Farm’s YouTube testing (791k+ views) confirmed it. Bob is the Oil Guy’s forum veterans confirm … Read more
We’ve spent the last two months running 8 top-selling oil stabilizers through real engines, from a high-mileage 189,000-mile Toyota Camry to a 6.0L Powerstroke that wouldn’t start on cold mornings. We measured cold-start noise, oil pressure readings after treatment, and Blackstone used-oil analysis to see which bottles actually changed wear-metal numbers. The best oil stabilizers … Read more
I have pulled engine oil pans on neglected cars and seen what comes out when no flush was ever used. Black, tar-like sludge. Clogged oil passages. Rings stuck so badly the cylinders barely fired. A good engine flush is the cheapest insurance you can buy against that buildup, and the best engine flush products turn … Read more
When you fire up a freshly built engine for the first time, there is a window of roughly 10 to 15 seconds where metal parts spin and slide without any real oil pressure. That cold start window is where engines die young, and the best assembly lubes are the single most reliable insurance policy against … Read more
Grease-caked engine bays were my weekend nightmare for years, until I started testing heavy-duty degreasers side by side. After running 10 different formulas through real-world cleanups on a stubborn 1989 GMC S-15, a daily-driver Tacoma, and a soot-covered 6.7L Power Stroke, the best engine degreasers separated themselves fast. This guide shares exactly what worked, what … Read more
A foaming engine degreaser is an aerosol or pump-spray cleaner that dispenses a thick, clingable foam designed to break down baked-on oil, grease, and road grime on engine bay surfaces without heavy scrubbing. The foam clings to vertical and irregular surfaces (valve covers, intake manifolds, brackets) and keeps the active citrus or surfactant chemistry in … Read more
Finding the best automotive base coats is the single biggest factor in how your paint job turns out, whether you are restoring a daily driver, blending a panel after a fender-bender, or building a show-quality custom finish. A basecoat is the colored layer sprayed over primer and sealed with clear coat, and it controls everything … Read more
Our team spent 90 days spraying, cutting, and buffing to find the best automotive clear coats you can buy in . We compared gloss depth, UV resistance, scratch recovery, and how each can handled real panel repairs on three test cars: a daily driver hood, a motorcycle tank, and a vintage fender. Every clear on … Read more