this is carried on from the days where engines were mostly hand-built and had inconsistencies that had to be "fixed" by a long break in period with conventional oil.my mechanic has a friend(a subaru tech)and he said wait about 15000 for a switch to synthetic.just his opinion.
I've heard that you should wait until about your 2nd scheduled maintenance stop to switch over to synthetic but it seems that a lot of you who have are having no problems, so whatever...just what the dealership told me. Supposedly the turbo runs much cooler with synthetic oilmy mechanic has a friend(a subaru tech)and he said wait about 15000 for a switch to synthetic.just his opinion.
Just curious, do you live in extreme cold temperature area? Because by putting in thinner oil that becomes thicker at operating temp might cause problems in the long run. You'll be encouraging more metal to metal contact with the thinner oil at start up, then at operating temp you'll be increasing oil pressure because of the thicker oil, there-by possibly creating bigger oil holes in the crankshaft bearings, which in turn will cause low oil pressure. Obviously this won't happen right away, but after 50-60k you might start having engine woes.