Engine Oil & Fluids Bible

ChatStick Co., Ltd.

About this app

Stop guessing in the oil aisle. Engine Oil & Fluids Bible turns the wall of cryptic bottle codes — 0W-20, API SP, dexos, GF-6, MB 229.5 — into plain English, and gives you a full toolkit to choose, change, and troubleshoot every fluid in your car.

This is a hands-on tool, not just a book. Everything works 100% offline. No ads. No subscriptions. No account or login. You own it.

INTERACTIVE TOOLS
• Oil Spec Decoder — paste any grade or approval and see exactly what each code means.
• Viscosity Selector — get the right grade for your climate, engine, and driving.
• Oil-Change Interval Calculator — your real interval based on oil type and severe-service conditions, not the 3,000-mile myth.
• Coolant Compatibility Checker — instantly know if it's safe to mix IAT, OAT, HOAT, or P-OAT coolants.
• Leak Diagnoser — identify a leak by color, location, and smell before it becomes a big repair.

MAINTENANCE TRACKER
• A guided fluid-service checklist organized into clear phases — oil, transmission, cooling, brakes, driveline, and diagnosis.
• Tick off tasks, watch your progress, and jump straight to the chapter that explains each one.

LEARN & REMEMBER
• Key Takeaways — quick, practical facts from every chapter you can skim before a job.
• Chapter quizzes with instant feedback and clear explanations.
• A searchable glossary of every term — SAE, API, ILSAC, dexos, PAO, LSPI, OAT, DOT and more.
• Image gallery pulled straight from the guide.

TRACK YOUR PROGRESS
• A dashboard that shows reading, tasks, and quiz progress at a glance.
• Earn achievements automatically as you learn and service your car.

THE FULL BOOK, INCLUDED
• As a bonus, the complete Engine Oil & Fluids Bible is built right in — every chapter, with adjustable text size, bookmarks, and resume-where-you-left-off. Read it anytime, fully offline.

WHAT'S COVERED
• Reading the label: SAE viscosity, API service categories, ILSAC, and OEM approvals.
• Cold-start wear and what the W number really means.
• Synthetic vs. conventional vs. blends, and the five base-oil groups.
• Turbo GDI engines and the LSPI problem.
• Oil-change intervals, severe service, and oil-life monitors.
• A step-by-step oil and filter change.
• Transmission fluids: ATF, CVT, and DCT.
• Coolant chemistry and why mixing types is a disaster.
• Brake, power-steering, and differential fluids.
• Leak diagnosis by color, location, and smell.
• A realistic fluid-maintenance calendar you'll actually follow.

BUILT FOR EVERY DRIVER
Whether you're a first-time DIYer or a seasoned weekend mechanic, the app meets you where you are — clear enough for beginners, deep enough to settle garage debates.

PRIVACY FIRST
Everything stays on your device. The app collects no personal data and works completely offline.

Built for phones and tablets.

What’s new

Version 1.0