Reaching 100,000 kilometres is a milestone for your vehicle — and it’s also the point where two easy-to-overlook services quietly become some of the smartest money you can spend. A coolant system flush and a transmission service aren’t glamorous, but skipping them is one of the most common ways drivers end up with a repair bill in the thousands. Here’s what they are, why the 100,000 km mark matters, and what happens if you put them off.
Engine coolant and transmission fluid don’t last forever. They both break down over time — losing the protective properties that keep your engine cool and your transmission shifting smoothly. By around 100,000 km, most vehicles have run long enough that the original fluids are worn out and starting to work against you rather than for you. Refreshing them at this stage resets the clock and heads off the kind of damage that’s expensive to undo.
Your coolant (antifreeze) does more than stop your engine from freezing in a Woodstock winter. It carries heat away from the engine, protects against corrosion, and lubricates parts like the water pump. As it ages, it turns acidic and picks up rust and scale that can clog the system and eat away at components from the inside.
A coolant flush removes the old, worn-out fluid — along with the gunk it’s collected — and replaces it with fresh coolant that protects your engine again. Left too long, degraded coolant can lead to overheating, a failed water pump, a cracked radiator, or in the worst case, serious engine damage. A flush is a fraction of the cost of any one of those repairs.
Transmission fluid keeps one of your vehicle’s most complex — and most expensive — systems shifting smoothly and running cool. Over 100,000 km, that fluid gets dirty, breaks down, and loses its ability to protect the internal parts. Old fluid is a leading cause of rough shifting, overheating, and premature transmission failure.
A transmission service replaces that tired fluid (and the filter, where applicable) so the system stays clean and protected. At Rick’s Automotive, our transmission service covers fluid changes, filter service, and transmission cooler and line care — the maintenance that keeps a transmission healthy for the long haul. It’s genuinely one of the cheapest forms of insurance against a repair that can run into the thousands.
If your vehicle is around the 100,000 km mark, a coolant flush and a transmission service are two of the highest-value maintenance items you can do. Both are affordable, both are quick, and both protect systems that are painful and pricey to repair once they fail.
Not sure where your vehicle stands? Bring it in and we’ll take a look, tell you honestly what it needs, and never push what it doesn’t.
Book Your 100,000 km Service · Call (519) 421-1144
Honest advice, every time. A+ BBB rated · 20 years in Woodstock.