Luisde8cd From Pitcairn Islands, joined Aug 2004, 2578 posts, RR: 29 Posted (9 years 1 week 5 days 8 hours ago) and read 10627 times:
A simple question... what's the recommended mileage-interval in which you have to drain your engine coolant and replace it with a fresh one? Also, what can happen if you don't change your coolant? Overheating perhaps?
MrChips From Canada, joined Mar 2005, 985 posts, RR: 0
Reply 3, posted (9 years 1 week 5 days 5 hours ago) and read 10600 times:
Quoting Luisde8cd (Thread starter): A simple question... what's the recommended mileage-interval in which you have to drain your engine coolant and replace it with a fresh one? Also, what can happen if you don't change your coolant? Overheating perhaps?
Most modern cars do not require coolant flushes for 100,000 miles (160,000 km) if they use DEX-COOL coolant (red). If you use standard (green or others) coolant, it is a good idea to flush every 15,000 miles (24,000 km) or so.
If you don't change your coolant, some very expensive things can happen. As coolant ages, the corrosion inhibitors break down. As they break down, a sludge starts to form in the low points of your cooling system, consisting of corroded metal. This can play havoc with thermostats, water pumps and radiators, blocking flow or getting into moving parts. If this happens, you are likely to either overheat or blow a head gasket.
Prebennorholm From Denmark, joined Mar 2000, 7111 posts, RR: 53
Reply 4, posted (9 years 1 week 5 days 5 hours ago) and read 10588 times:
Never (VW Golf 1998, 244,000 miles / 391,000 km).
But it depends on type of coolant and what materials used in the engine.
Refer to the driver's manual.
Be sure to use the recommended type of coolant. Wrong type of coolant may start a runaway chemical eating of the inside of the engine, coolant pump and radiator.
The chemical properties of the car components and the coolant are from the car manufacturer adjusted to fit together.
On most older cars, maybe also newer cars of different make, you have to change coolant every two years in order to avoid chemical reduction of some parts of the engine, typically the top gasket. Those "old" types of coolant are mixed with some chemicals which are "wasted" more easily than the engine components in the chemical processes. But when they are gone (after two years), then all chemical hell breaks lose. Milage is not important. The chemical processes are active at all time, but are just a little faster when the engine is hot.
But most important, use the RTFM system (Read That F¤%&ing Manual).
Always keep your number of landings equal to your number of take-offs