--- title: Keller-Heartt News Blog description: Keller-Heartt is the leading online distributor of oils, lubricants, grease, and chemicals for Industrial, Automotive, and Trucking. 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Free shipping - all orders! ### Subscribe to Our Blog! ### [What Causes Transformer Overheating? The Role of Electrical Insulating Oil](https://info.kellerheartt.com/blogs/transformer-overheating) Learn the top causes of transformer overheating and how electrical insulating oil protects equipment, prevents downtime, and extends transformer life. Brian McGrath Sep 10, 2026 ### [How Often Should You Change Metalworking Fluids? Signs It's Time](https://info.kellerheartt.com/blogs/how-often-to-change-metalworking-fluid) Learn how often to change metalworking fluid, the warning signs it's overdue, and how cutting oils compare to soluble oils for your next changeout. Brian McGrath Sep 2, 2026 ### [PC-12 Engine Oil Standards: What Fleets Need to Know Before 2027](https://info.kellerheartt.com/blogs/pc-12-engine-oil-standards-fleet-guide) PC-12 replaces CK-4 and FA-4 in January 2027. Learn which category fits your fleet, what improvements to expect, and how to prepare. Brian McGrath Sep 1, 2026 ### [Straight Oil vs. Water-Soluble Coolant: Which Metalworking Fluid Does Your Machine Actually Need?](https://info.kellerheartt.com/blogs/water-soluble-cutting-coolant) Compare straight cutting oil and water-soluble coolant by machine type, speed, and heat load to pick the right metalworking fluid for your shop. Brian McGrath Sep 1, 2026 ### [Wagging Tails at Work: Keller-Heartt Welcomes the Work & Wellness Research Institute](https://info.kellerheartt.com/blogs/wagging-tails-at-work-visits-keller-heartt) Keller-Heartt hosts the Work & Wellness Research Institute, exploring the benefits of therapy dogs in the workplace for employee well-being and... Brian McGrath Aug 4, 2026 ### [Food-Grade Lubricants for Breweries: Where to Use Them and How to Choose the Right One](https://info.kellerheartt.com/blogs/food-grade-lubricants-brewery-equipment) Learn how to choose food-grade lubricants for brewery equipment, including H1 lubricants, glycol systems, and maintenance best practices. Brian McGrath Jul 20, 2026 ### [What Is a Shell Prestige Licensed Distributor? (And Why It Matters for Your Lubricants)](https://info.kellerheartt.com/blogs/shell-prestige-licensed-distributor) Keller-Heartt is a Shell Prestige Licensed Distributor, DPQA-certified to the industry’s most rigorous bulk-lubricant standard. Here’s what that... Brian McGrath Jul 10, 2026 ### [What Is Industrial Preventive Maintenance? A Practical Guide for Reliable Operations](https://info.kellerheartt.com/blogs/what-is-industrial-preventive-maintenance) What is industrial preventive maintenance, and why does it matter? Discover the main types of industrial maintenance and how to build a reliable PM... Brian McGrath Jun 23, 2026 ### [How to Use a Degreaser for Oil Stains in Your Auto Shop (Concrete, Clothes & More)](https://info.kellerheartt.com/blogs/degreaser-for-oil-stains) Learn how to remove oil stains from concrete, clothes, and carpet using a degreaser. Step-by-step tips + our top product pick for auto shops. Brian McGrath Jun 23, 2026 ### [What’s the Best Food-Grade Gear Oil for Food & Beverage Facilities?](https://info.kellerheartt.com/blogs/food-grade-gear-oil) What is food-grade gear oil? Learn why NSF H1 and ISO 21469 certification matters, how to pick the right food-grade gear oil, and shop FUCHS and... Brian McGrath May 26, 2026 ### [SCR System Fault: What It Means, What Causes It, and How to Prevent Costly Downtime](https://info.kellerheartt.com/blogs/scr-system-fault) What is an SCR system fault? Learn the most common causes, how to fix SCR system faults, and how to prevent costly downtime with proper DEF handling. Brian McGrath May 6, 2026 Automotive ### [Is Brake Cleaner the Same as Carb Cleaner? Key Differences Every Mechanic Should Know](https://info.kellerheartt.com/blogs/is-brake-cleaner-the-same-as-carb-cleaner) Wondering what the differences are between carb cleaner vs. brake cleaner? Our experts break down when to use each and how to avoid costly mistakes. Brian McGrath Apr 28, 2026 ### [Metalworking Coolant Management: Practical Shop Checklist](https://info.kellerheartt.com/blogs/metalworking-coolant-management) Optimize your shop with expert metalworking coolant management tips. Reduce waste, extend coolant life, and improve uptime and performance. Brian McGrath Apr 21, 2026 ### [Food Safety Audit Checklist: Pass Inspection & Earn Compliance](https://info.kellerheartt.com/blogs/food-safety-audit-checklist) Prepare smarter for your next food safety audit with a detailed checklist covering sanitation, maintenance, and lubrication essentials. Brian McGrath Apr 6, 2026 ### [Is It Bad to Idle a Diesel for Long Periods? The Truth About Wear, Fuel, and Maintenance](https://info.kellerheartt.com/blogs/is-it-bad-idle-diesel) Is idling bad for a diesel engine? Learn the real effects of diesel idling, common myths, and how to prevent wear, fuel loss, and carbon buildup. Brian McGrath Mar 25, 2026 Oil ### [Oil Viscosity Chart & Conversion Guide: ISO, AGMA, and SAE Explained](https://info.kellerheartt.com/blogs/oil-viscosity-conversion-chart) Learn how to convert oil viscosity grades between ISO VG, AGMA, and SAE using our oil viscosity chart. Understand lubricant ratings and choose the... Brian McGrath Mar 12, 2026 Coolant ### [What Are the Signs of Problems in CNC Coolant Systems? Plus, How to Prevent Them](https://info.kellerheartt.com/blogs/cnc-coolant-system-health-problems) Spot CNC machine coolant health problems early—odor, sludge, dark color, foaming—and learn how to prevent downtime, tool wear, and costly machine... Brian McGrath Feb 25, 2026 Automotive ### [An Overview of Automotive Fluids: What Every Auto Shop Should Have on Hand](https://info.kellerheartt.com/blogs/automotive-fluids) Find out which essential automotive fluids every auto shop needs, service intervals to follow, and how to choose the right products to protect... Brian McGrath Feb 11, 2026 Lubricant ### [H1 Lubricants Explained: How They Compare to H2 Lubricants and Why It Matters](https://info.kellerheartt.com/blogs/what-are-h1-lubricants) Using the wrong lubricant can fail an audit. Discover why H1 lubricants matter, how they differ from H2, and where food facilities go wrong. Brian McGrath Jan 28, 2026 BlueDEF ### [DEF Crystallization Explained: Causes, SCR Damage, and How Fleets Can Prevent It](https://info.kellerheartt.com/blogs/what-is-def-crystallization) Crystallized DEF is one of the leading causes of SCR failure and downtime. Find out what causes it, how to fix it, and how to prevent it. Brian McGrath Jan 19, 2026 Aeroshell ### [Aeroshell W100 vs. W100 Plus​: The Ultimate Breakdown for Smarter Aircraft Engine Care](https://info.kellerheartt.com/blogs/aeroshell-w100-vs-w100-plus) Debating Aeroshell W100 vs. W100 Plus? Get the insider breakdown aircraft owners trust to choose the best oil for power, protection, and engine... Brian McGrath Dec 17, 2025 Oil ### [How Long Can You Store Motor Oil? Plus, Where and How to Store It Properly in Your Auto Shop](https://info.kellerheartt.com/blogs/how-long-can-you-store-motor-oil) Extend oil life and avoid costly mistakes with smart motor oil storage practices every auto shop needs. Brian McGrath Dec 15, 2025 Lubricant ### [Optimizing Your Shop: What Type of Lubricant Is Used for Machining Metal?](https://info.kellerheartt.com/blogs/what-type-of-lubricant-is-used-for-machining-metal) Maximize tool life and cut quality with the right machining lubricant. Get the pro insights top metalworking shops rely on every day. Brian McGrath Dec 9, 2025 Mobilfluid ### [An Overview of the Best Mobilfluid 424 Equivalent: Shell Spirax S4 TXM](https://info.kellerheartt.com/blogs/best-mobilfluid-424-equivalent) Explore the top 5 advantages of Shell Spirax S4 TXM for tractors, hydraulics, and wet brake systems in even the toughest farm conditions. Brian McGrath Nov 21, 2025 Oil ### [Why Oil Cleanliness Matters: Understanding Contamination and How to Prevent It](https://info.kellerheartt.com/blogs/oil-cleanliness-matters) Discover how clean oil prevents wear, cuts costs, and keeps equipment running efficiently. Brian McGrath Nov 6, 2025 Automotive ### [Tough Jobs, Clean Hands: Finding the Best Hand Cleaner for Mechanics and Auto Shops](https://info.kellerheartt.com/blogs/best-hand-cleaner-for-mechanics) Tired of scrubbing endlessly? Find the best hand cleaner for mechanics that cuts grease fast and keeps your hands feeling great. Brian McGrath Nov 3, 2025 Automotive ### [Should You Use a Cutting Oil Substitute? When It Works & When It Doesn’t](https://info.kellerheartt.com/blogs/cutting-oil-substitutes) Thinking of using a cutting oil substitute? Learn when to choose water-based coolants vs. neat cutting oils and to avoid mistakes that shorten tool... Brian McGrath Oct 3, 2025 Automotive ### [Transmission Fluid Types: A Complete Guide for Auto Shop Owners](https://info.kellerheartt.com/blogs/transmission-fluid-types) Choosing the right transmission fluid types means happier customers and fewer breakdowns. Our experts share which ones belong in your shop. Brian McGrath Sep 10, 2025 Silicone ### [What is Food-Grade Silicone? And Is It Really Safe to Use in Manufacturing Facilities?](https://info.kellerheartt.com/blogs/what-is-food-grade-silicone) Discover the secrets behind food-grade silicone lubricants. Safe for food contact, tough on friction, and trusted across the industry. Brian McGrath Aug 21, 2025 Oil ### [Why is My Diesel Engine Oil Black After Oil Changes? What's Normal & What's Not](https://info.kellerheartt.com/blogs/why-is-my-diesel-engine-oil-black-after-oil-changes) Your diesel oil color tells a story—from amber to milky white to black. Our experts break down what's normal, what's not, and when it's time to worry. Brian McGrath Aug 19, 2025 [1](https://info.kellerheartt.com/blogs/page/1) [2](https://info.kellerheartt.com/blogs/page/2) ... [4](https://info.kellerheartt.com/blogs/page/4) © 2025 Keller-Heart Oil All rights reserved