Originally Posted By: 01rangerxl
Well, OP was asking about how to achieve longevity, not how to run it into the ground so there's an excuse to get a new one.
Problems rarely just coincide at just the right time so you know "okay, now is the time."
Really well maintained vehicles rarely have so many issues that they are one repair away from being junked. If you really keep up with it, it just doesn't get to that point.
What usually happens is people just feel less motivated to keep a car up, push things off, and then one day (usually when the car strands them or threatens to do so), decide they must do something about the situation, whether it is repairing the car or getting rid of it. A lot of people will shotgun repairs when the car really acts up, but the damage is already done and they are too late. Those "one too many" repair situations are often this...they start tackling stuff on the list, finally, but then run into something that totals the car out, at least for them.
Also, a lot of people severely exacerbate problems by not dealing with them early. Replace a leaking output shaft seal on a trans at the first sign of leakage, and it's no big deal. Wait until the trans loses so much fluid that it's slipping or shifting bad, and you may have gone too far. If you deal with things as they crop up, the car just doesn't get that junky.
Bear with me for a moment, I'm trying to put it into context: I've known that the rear axle on my car has been bent for a while, toe-in is excessive. Just haven't figured out what I want to do there, other than aggressive tire rotations. Brakes finally looked bad, so I did those ($400!)--only to find a torn CV boot. And the lower control arm bushings are cracked. They were not this past fall. So, I could stand to replace all the rubber bits in the suspension, do a full refresh after nearly 300kmiles, plus perhaps a new rear axle to replace the bent one. Add in that I still have the original radiator, altenator and usual stuff, and that I have rusted out fenders, door and hatch, needs new tires too, and...?
I've done struts twice, wheel bearings once, control arm bushings once, and a few other repairs as they popped up (turbo and clutch). A few windshields too. Honest, I've tried to do repairs when I've noticed things are broken. At least the mechanical ones. Rust, that is finally starting to become a real concern; it's still cosmetic though. At least it hasn't stranded me recently (two tows, once for turbo, once for fuel pump, and there was a stretch this winter during a cold snap where I didn't trust it to start--probably bad fuel, it cleared up eventually).
So it strikes me as a "good time" to quit it, or at the least to do the least amount of work to keep it going. Seems like, after 300k, it's a valid time to do a full refresh: but for the amount I'd spend on that, is it more cost effective to ignore for a year or so, then just replace the vehicle?