The Subaru 4 cylinder 2.5 L “Boxer engine” has had numerous problems with head gasket (HG) coolant leaks. The HG problems are outlined on the website http://use…asket.html Summary 1. The HG leaks occur in 2.5 L engines manufactured since 1996. Subaru claims the problem was correct…

Yes, it’s a poor design. Yes, it’s disappointing to have that type of failure at such seemingly low miles. However, once the repair has been done the first time (assuming the use of high quality aftermarket (felpro MLS type are excellent) gaskets and quality workmanship from your mechanic), this wil…

Thanks , you just dragged up a 6 year old thread that has spam on it.

There was a thread here a while ago which suggested the subie head gasket quality isn’t the actual problem, but just that the head gasket in that engine design has a more challenging job to fulfill than other engine designs. B/c of the tight tolerances involved, resulting from an engine design obje…

when I owned Subies, I bookmarked this article: https://allwheeldriveauto.com/subaru-head-gasket-problems-explained/ https://allwheeldriveauto.com/subaru-head-gaskets-problems-explained-part-ii/ essentially: if owner neglects his car, this opposite-engine design will give up on these gaskets due …

I have my own opinions about why the head gaskets fail. If it was block design then this should mean that any head gasket replacement is futile. I’ve done a lot of Subaru head gasket replacements and never had a single one come back.

So exactly what is the story behind this “ring land” failure?

ok4450 - Weak cast pistons, bad factory tune, engine knock among other things.

I can’t say that I’ve ever seen a case of ring land failure on a Subaru and the few that I’ve seen with a rod bearing knock usually had a history of few oil changes and/or running the engine low on oil. If by engine knock you mean pre-ignition rattles that will definitely cause a piston problem. In…

Are you a Subaru tech? These engines are infamous for all of the issues I cited.

Subaru 2.5 L engine - the worst engine ever?

Maintenance/Repairs

badmike February 24, 2017, 6:38pm 18

Subaru EJ engines have numerous ongoing issues that Subaru refuses to address; head gasket failures, “ring land” failures, rod bearing failures, high oil consumption, etc. Any of these issues can, and often do lead to catastrophic engine failure.

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Subaru 2.5 L engine - the worst engine ever?

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