The manufactures claim struts last for approx. 50,000 to 60,000 miles.
But it depends on where you live, the driving conditions, your driving habits and the year and make of a vehicle.
〉 Answered on Feb 18th, 2014 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd
Struts deteriorate gradually but typically 60,000 miles or so.
〉 Answered on Feb 18th, 2014 by Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube
That's a lot of miles on original struts. Usually depends on how & where you're driving. You can test them yourself & see how they react to your weight on them, or you can take a look and see if they're moist or greasy.
〉 Answered on Feb 18th, 2014 by Gelina Aquilina, Service Advisor / Mechanic at
Most strut manufacturer's will tell you 40-80,000 miles. At 240,000 you might be better off doing quick struts as the springs tend to get weaker with higher mileage.
〉 Answered on Feb 18th, 2014 by Helaine Kurot, Owner/Technician at 360 Automotive