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Old 05-11-2008, 10:24 PM   #1
Scooby Newbie
Member#: 71108
Join Date: Sep 2004
Chapter/Region: SCIC
Location: San Diego, CA
2005 WRX STi

Default Used Oil Analysis - Amsoil ASL 5W30 - 2005 Subaru WRX STi

This is my latest oil sample from my STi. Just curious if anybody has any input on this. I received more than enough feed back last time, see the following thread for that :
My driving habits are detailed in the original post there. This 5000 mile interval was almost entirely to/from work driving.

The last UOA was ASL 5W30 as well, the previous two were Castrol Syntec 10W40.

The thing I'm most concerned about here is the substantial uptick in iron (Blackstone is not concerned). It was a longer run, and I'm still below average here. Not sure what a "problem" level would be for iron. My guess is substantially higher?

Also, a question: Why does Blackstone say for fuel %, that <0.5 is less than "TR"??? "No fuel showed up this time, so the trace we had been seeing was likely due to something operational." I guess a "trace" is a higher number than 0.5%??? This didn't make sense to me...I'm used to "trace" meaning a very small amount, to which it wouldn't be meaningful to assign a percentage (maybe less than 0.1% in this case). I guess Blackstone has a different definition.

Consumption is about the same as normal...higher than I'd like, but it's always been that way.

Silicon is also steadily increasing, even though I replaced my air filter for this change.

I screwed up with this sample and only managed to get the last bit of oil out of the engine, which isn't how you're supposed to do it. I suppose this may have something to do with the silicon; this was probably a dirtier sample.

I will post at BITOG and ask questions too, but I always like to hear what the Subaru crowd has to say.

Next oil change I will be putting in Amsoil 5W40, since I already bought it...

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