Subarus hold less than 1 qt of oil in the diff, so there's not a lot to lose. Most Jeeps and domestic 4 x 4s would hold 2 qts +.
As things get older they will leak. Does it leak enough to drip where you park it or is it blown on other parts besides the diff? I think that would be too much, especially if you drive it a lot.
Tighten the plug if it's leaking there, that would be easy to do. Otherwise, it's axle seals, pinion seal, or diff cover sealant to repair at some point. If it's a local beater car you don't want to spend money on or you don't put many miles on it you could leave it awhile with a minor leak and check occasionally. If it's newer or your main transportation then I would tend to fix sooner rather than later.
I've had Foresters at 90,000, 120,000, and 135,000 mi and none of them leaked at the rear diff. Sadly, they are more likely to lose headgaskets!
I did have an Outback/Legacy loaner once with 225,000 that did have rear diff leak that I pointed out as marginal and likely needing fixed when I returned it. I believe I noticed a few drips maybe the size of dimes on the garage floor after having for a few days where it would be parked overnight.
As things get older they will leak. Does it leak enough to drip where you park it or is it blown on other parts besides the diff? I think that would be too much, especially if you drive it a lot.
Tighten the plug if it's leaking there, that would be easy to do. Otherwise, it's axle seals, pinion seal, or diff cover sealant to repair at some point. If it's a local beater car you don't want to spend money on or you don't put many miles on it you could leave it awhile with a minor leak and check occasionally. If it's newer or your main transportation then I would tend to fix sooner rather than later.
I've had Foresters at 90,000, 120,000, and 135,000 mi and none of them leaked at the rear diff. Sadly, they are more likely to lose headgaskets!
I did have an Outback/Legacy loaner once with 225,000 that did have rear diff leak that I pointed out as marginal and likely needing fixed when I returned it. I believe I noticed a few drips maybe the size of dimes on the garage floor after having for a few days where it would be parked overnight.
