I ran a can of that Subaru upper engine cleaner through my little 1.8 and it definitely helped a little bit, no doubt it wouldn't have done nearly as much as fully pulling everything apart and cleaning it properly, but it helped a bit for sure, engine runs a bit smoother and feels a little more responsive. For the like $12 dollars it cost and twenty minutes to do, I'd say it was very worthwhile while doing a bit of a service.

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