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Figured I'd keep up with this just in case anyone wanted to see the progress. I do have to say I'm a little leery of their suggestion of doubling the stock oil change interval.

For the record below are the service manual oils. Preferred: 5w30 Recommended above -20*C: 10w30, 10w40, 10w50 Recommended for severe driving conditions (i.e. desert areas, very high temps, heavy-duty applications): SAE No. 30, 40, 10w50, 20w40, 20w50

Thanks for all the responses. I look forward to more info and opinions on the recommended vs alternatives question. So far I'm getting a it's not bad, it's not great but there are better choices than 20w50. Personally I run Rotella T6 5w40 in my '08 STi. It's a solid oil at a good price point...

What are the drawbacks/benefits of using the recommended 5w30 vs 20w50? These are the specifics of the car in question. 1. Vehicle: Subaru STi (ie 2.5L turbo) 2. Manual suggested: SAE 30 to 20w50 under "severe conditions" 3. Where you live: Mobile, AL 4. How you drive: Fast 5. What your daily...

Alright so ran a fill of Rotella T6 out to 4k miles and sent in a sample to Blackstone. The report came back with high silver content which they say may speak to bearing wear and copper which is pretty standard from Subarus. The report is below. On a side note, when the oil was draining it was...

Ended up going with Rotella T6 5W-40 and a Subaru OEM blue filter. Managed to get the T6 on sale so I stocked up and picked up a 12 pack of Subaru filters on the cheap. I'm going to start with a 4k run then go out to 5k if the analysis comes back clean. I'll let you know how things go. Thanks...

Alright folks, yet another Subaru guy asking for advice. I guess, at the very least, it says we care or maybe are paranoid about our cars. Here is the pertinent info. 1. What kind of vehicle you have Just picked up a 2008 Subaru STi hatch back with 33,000 miles on it. 2. What your owner's...