How Bad Does A Leak Have To Be Before You’ll Fix It? Autopian Asks

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Some car enthusiasts are fastidious about maintenance. If a door handle is squeaking, they’ll be right on the job, repairing it. Some are happier to let the small stuff slide, while others will let their cars fall to pieces before their very eyes. In that regard, I ask you a question. How bad does a leak have to be before you’ll consider fixing it?

Obviously, this is something that can change greatly depending on the fluid involved. If your vehicle is leaking gas, like Gossin’s pickup, you might want to fix that immediately. Similarly, a loss of brake fluid might spur you to immediate action. But not all leaks are so disastrous. A slow oil leak can weep for months or years without causing too much trouble. Similarly, losing a little coolant here and there might not require you to immediately throw the car on jack stands to perform restorative repairs.

I myself land on the lazier side when it comes to leaks, but I do so in an educated fashion. If my car is losing coolant at a rapid rate, where I’m routinely seeing ounces of fluid on the driveway, I’ll probably get to it on the next free weekend I have. If it’s losing quarts, I’m probably not driving it anywhere unless I really need some KFC.

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My Merc randomly threw up all its coolant one day in 2022. I thought I traced it to a corroded freeze plug, but somehow once I topped it off I never had any problems ever again. Until the radiator end tank wore through earlier this year.

Oil, I’m even more lackadaisical about. But that’s for good reason—for oil leaks are often quite slow. I’ve had a ton of cars that burn a little oil, or leak some out of the valve cover seals. This is rarely a big problem. I’ll just top up the oil with a half-a-quart or so every three months, and the car will run just fine. Sure, I could pull the intakes off and all the wiring and spark plug leads and spend hundreds of dollars on new seals, but… why? I rarely have any free time as it is. I’d rather spend $20 on a liter of oil a few times a year and enjoy driving instead of tedious wrenching jobs with little benefit. Plus, the driveway stains come up easy with some dishwashing liquid.

This topic comes to mind because of my beloved Audi TT. It’s currently leaking power steering fluid, and doing so at a frustrating rate. It’s only losing maybe a shot glass or two a month. However, that’s enough to drop it below minimum on the dipstick, and it gets the power steering pump whining like a city bus in cold weather. I don’t want to spend big money on replacing the pump, so I’m trying to keep it topped up.

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Luv the Audi. Don’t luv da leakz. It ran great on our first 8-hour roadtrip, maybe I need to tell that story.

The problem I have is that this is likely not an easy fix. Maybe I’m lucky and it’s just a weeping fitting or hose. But more likely it’s a rack seal that’s gone, or even fatal wear to the rack itself. That’s big money and big labor, because it’s a job I don’t have space to tackle myself.

So basically, I’m getting by with occasional top-ups once again, even on my dream car. But what say you—how bad does a leak have to get before you’ll fix it?

Image credits: Lewin Day

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97 thoughts on “How Bad Does A Leak Have To Be Before You’ll Fix It? Autopian Asks

  1. The driveway spots bother me and generally get me to fix leaks, but it all depends on what is leaking. I’m currently living with a (very slowly) leaking timing chain cover because fixing it is an engine-out job.

      1. 25ish years ago, someone at Toyota thought a <2″ clearance from the accessory drive pulleys to structural steel was a worthy compromise to make in the name of getting the hot engine into the Corolla Chassis. Even changing the serpentine tensioner requires disconnecting all the mounts and jacking the engine halfway out of the bay.

  2. The driveway spots bother me and generally get me to fix leaks, but it all depends on what is leaking. I’m currently living with a (very slowly) leaking timing chain cover because fixing it is an engine-out job.

      1. 25ish years ago, someone at Toyota thought a <2″ clearance from the accessory drive pulleys to structural steel was a worthy compromise to make in the name of getting the hot engine into the Corolla Chassis. Even changing the serpentine tensioner requires disconnecting all the mounts and jacking the engine halfway out of the bay.

  3. Coolant or fuel leak: fix right away. Brake fluid leak: obviously fix right away. Oil dripping onto something hot: fix right away. Everything else: I’ll get to it eventually.

  4. Coolant or fuel leak: fix right away. Brake fluid leak: obviously fix right away. Oil dripping onto something hot: fix right away. Everything else: I’ll get to it eventually.

  5. I have a small coolant leak (when cold, it seems to seal itself when the truck gets to temp) from my water pump gasket on my first gen Tacoma (stupidly used a non-OEM gasket during a timing belt job, big mistake). I’m about 10k from needing another timing belt so until then I just check the coolant level before driving the truck until then. It helps that it’s not a daily and checking the fluids once a week isn’t exactly a bad practice in general…

  6. I have a small coolant leak (when cold, it seems to seal itself when the truck gets to temp) from my water pump gasket on my first gen Tacoma (stupidly used a non-OEM gasket during a timing belt job, big mistake). I’m about 10k from needing another timing belt so until then I just check the coolant level before driving the truck until then. It helps that it’s not a daily and checking the fluids once a week isn’t exactly a bad practice in general…

  7. It depends on the difficulty of the job and the risk of putting it off.

    Miata has a leaking valve cover gasket? I’ll do it right away. Subaru has two leaking awkwardly-placed and difficult to access valve cover gaskets? Keep topping up the oil.

  8. It depends on the difficulty of the job and the risk of putting it off.

    Miata has a leaking valve cover gasket? I’ll do it right away. Subaru has two leaking awkwardly-placed and difficult to access valve cover gaskets? Keep topping up the oil.

  9. Bought an early wrx a few years back that had the fuel line leak again due to age. Also bought a fire extinguisher the day I brought it home. The fix was multiple little 2-3” hoses connecting the main fuel feed to the injector rail and I had to pull the intake manifold to replace them, but I didn’t put it off for long as firey death is not my idea of fun.

    I’ve already replaced the passenger VC gasket once and it still seeps, but doesn’t spot the ground, so the new new gasket is still on the shelf

  10. Bought an early wrx a few years back that had the fuel line leak again due to age. Also bought a fire extinguisher the day I brought it home. The fix was multiple little 2-3” hoses connecting the main fuel feed to the injector rail and I had to pull the intake manifold to replace them, but I didn’t put it off for long as firey death is not my idea of fun.

    I’ve already replaced the passenger VC gasket once and it still seeps, but doesn’t spot the ground, so the new new gasket is still on the shelf

  11. Depends on the leaks, depends on the car. My 300kkm Clio 2 can be leaking, I don’t care. My recently back on the road 280Z? I don’t want to see a drop of fluid oozing out.

  12. Depends on the leaks, depends on the car. My 300kkm Clio 2 can be leaking, I don’t care. My recently back on the road 280Z? I don’t want to see a drop of fluid oozing out.

  13. “ A slow oil leak…” AKA English rustproofing? Why would you want to “fix” that?
    Sometime after my Subaru Impreza Outback had been rear ended by the neighbors Landrover, very slowly hit on the left rear corner by the UPS truck. and i think the trunk got broken into but it was hard to tell, I noticed that a lot of water was leaking into the trunk. Finally got fed up with the situation and drilled three 1/4 inch holes in the low places where the water was collecting. Problem solved!

  14. “ A slow oil leak…” AKA English rustproofing? Why would you want to “fix” that?
    Sometime after my Subaru Impreza Outback had been rear ended by the neighbors Landrover, very slowly hit on the left rear corner by the UPS truck. and i think the trunk got broken into but it was hard to tell, I noticed that a lot of water was leaking into the trunk. Finally got fed up with the situation and drilled three 1/4 inch holes in the low places where the water was collecting. Problem solved!

  15. If it drips on the ground I fix it. If it just leaves a stain on the underside I don’t. This is actually policy for all new cars under warranty for most brands. If it is wetness on the engine that is normal seepage. It has to form droplets that hit the ground to be a warranty repair. My 60 year old daily driver doesn’t leave anything on my garage floor, but there is a little seepage here and there. I really need to get around to pressure washing the bottom of it actually.

  16. If it drips on the ground I fix it. If it just leaves a stain on the underside I don’t. This is actually policy for all new cars under warranty for most brands. If it is wetness on the engine that is normal seepage. It has to form droplets that hit the ground to be a warranty repair. My 60 year old daily driver doesn’t leave anything on my garage floor, but there is a little seepage here and there. I really need to get around to pressure washing the bottom of it actually.

  17. > It’s only losing maybe a shot glass or two a month

    I think my tequila might be your power steering fluid reservoir. My whiskey fluid reservoir leaks considerably faster.

  18. > It’s only losing maybe a shot glass or two a month

    I think my tequila might be your power steering fluid reservoir. My whiskey fluid reservoir leaks considerably faster.

  19. Just about to scrap my wife’s mini due to oil leaks. It was looking pretty wet in the engine bay and I couldn’t be arsed to fix it as I really hate working on German cars. Sent it to a local indy and was told at least 5 big leaks and valve guides to stop the blue smoke. Not worth fixing. I begged her not to buy another mini but we want what we want. Open to offers if anyone’s in the Sheffield area and want a reasonable interior. My spitfire get to leak all day long without a worry in the world, just top it up when it get squeaky.

  20. Just about to scrap my wife’s mini due to oil leaks. It was looking pretty wet in the engine bay and I couldn’t be arsed to fix it as I really hate working on German cars. Sent it to a local indy and was told at least 5 big leaks and valve guides to stop the blue smoke. Not worth fixing. I begged her not to buy another mini but we want what we want. Open to offers if anyone’s in the Sheffield area and want a reasonable interior. My spitfire get to leak all day long without a worry in the world, just top it up when it get squeaky.

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