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it will do bugger all except put rust on your spark plugs and cause misfiring.
i found the best thing on my 3.0 was to change the air intake system away from that silly nostril breathing low flow...

golden rule of subaru engines. no 91 octane gas !!!!!

since about 2013 i think.
belts belong in turntables not drive trains !!

i'm on my 3rd subby. a 3.0 legacy wagon in which i get better milage than my 2.0 forester. wouldnt touch a new subaru as they have gone cvt gearboxes. bloody disgraceful

oil changes are easy, you will need to lift the front of a legacy up to work under it though as they are very low. sparks plugs are a bit of a bugger but can be done at home. use decent plugs and...

i have an 07 legacy 3.0 with tiptronic as i couldnt find a manual. its my 3rd subby. i wont be buying a new one as they have gone CVT which is bloody disgusting.
my 3.0 from chch to blenheim and...