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    Amsoil ASL 5W30, 2005 Subaru WRX STi, 5000 miles

    Originally Posted By: alanlcit The first two oil samples were Castrol Syntec 10W40, the latest two are Amsoil ASL 5W30. Sorry about the multiple posts. Meant to ask one more question: Any input on switching to Amsoil European formula 5W40 as a means to reduce oil consumption a little bit...
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    Amsoil ASL 5W30, 2005 Subaru WRX STi, 5000 miles

    Originally Posted By: alanlcit Not sure why the silicon is so (relatively) high...replaced my filter at the beginning of this interval...maybe contaminated sample, some dirt off the oil pan bottom or something? BTW, when I said filter, I meant engine air filter. I also change the oil filter...
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    Amsoil ASL 5W30, 2005 Subaru WRX STi, 5000 miles

    Background: Just a normal driver of my STi, I don't do anything more crazy than vigorous freeway pulls. The first two oil samples were Castrol Syntec 10W40, the latest two are Amsoil ASL 5W30. I screwed up on this sample and managed to only get the last bit of oil out of the sump. Questions...
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