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Originally Posted By: 147_Grain Amsoil likely uses a higher quality basestock (i.e. more group IV PAO and Group V POE) than the Rotella T-6 and this is why it flows much better at room temperature. You do realize that Amsoil's EFM is a European Car Formula 5W-40 Synthetic Motor Oil with...

Well I topped it off with some T6 last night and immediately noticed that the Rotella seemed far thicker than the Amsoil EFM even though they are the same weight. While the Amsoil used to flow easily down the fill tube, I had to slow down the fill of the T6 (and spilled everywhere in the process...

Just checked my oil level and it's below the low marker with less than 600 miles on the oil! Is this oil just too thin for my application or what?!

Originally Posted By: gregoron What oil filter are you using? You may want to use OEM if not already. You can also check if your spark plugs are spec. I'm using an Amsoil filter, which as I understand, is better than most you can buy at an auto parts store. Plugs were replaced Originally...

Yeah that's what I'm concerned about... Could the oil be shearing down since it is barely in the viscosity spec after adding 3.5 quarts in 4700miles? (Added about 2.5 quarts after 3000 miles)

Well I got the change done and it seems like any major consumption has slowed down as I am no longer adding additional oil. Here's the less than stellar UOA I did noticed my coolant was a bit cloudy but I also saw that the RP 5w-30 that I rand before this had a decent amount of sodium in it...

No codes stored in ECU. I'm thinking it might be the PCV valve after doing some research. I have recently began to notice a slight fluctuation/roughness at idle when cold. Possibly a combination of using a coarser oil and letting contaminates build up during the extended interval. The car has...

Awesome, thank you! So I'm guessing the larger hose plugs into the inlet pipe? Edit: I do have a scan tool, but I currently don't have a CEL. Should I check them anyway?

Originally Posted By: LeakySeals So you changed 2 variables, the oil brand and switched to extended OCI's? Did the oil consumption start immediately after changing oil brand or later on? Oil consumption started after about 3000-3300 miles into the oil change. I know this oil is meant for...

I will be doing a change and UOA ASAP but I am concerned that there might be an underlying problem with the oil or the engine.

Let me preface this thread by saying this is my first experience with extended oil change intervals. I changed the oil in my modified 05 Legacy GT turbo about 4600 miles ago (recommended 3750) based on a UOA from Blackstone. The analysis was of RP 5w-30 but I have switched to Amsoil Euro Full...

I saw a couple people were interested in a VOA. I posted it in another thread but figured I would post it here too.

Bluesubie - I'm running open source on the stock ECU running VERY rich on a conservative tune. Right now I'm running Amsoil EFM 5w-40 with Amsoil filter. The car has the K&N Typhoon intake so I'm running a K&N cone filter. bigjl - I agree, the new Legacys look like friggin' boats! ibrahim - I...

Yes the USDM has the 5EAT automatic...but mine is the 5MT. That's interesting though - the US didn't get that body style until 2005. It's too bad you guys didn't get the turbo though, it's really fun. It is the same drivetrain (motor, trans, diff, etc) as the 06+ WRX's (the leggy's got it a...

I'm thinking about switching to a more robust oil when the weather finally decides to warm up so I'm look for suggestions. I was thinking about Motul, a different Amsoil formula or possibly switching back to the M1 racing. Open to opinions... Edit: That Amsoil 5w-30 HDD looks intriguing....

I got the UOA from the Royal Purple back yesterday...still waiting on the unused OA on the Amsoil. I'm interested to know what you guys think. Keep in mind, this is my first full interval with me driving so of course I opened her up more than I do now. I also tend to get stuck in rush...

Welp, just changed out the oil. Maybe a placebo effect, but it seems like the engine quieted down quite a bit. I'm sending off an unused sample of the 5w-40 today and post the stats when I get the results. Pablo, I got my oil from a dealer that sells to individuals locally. My baby seems to be...

Amsoil 5w-40 Data Sheet Not as impressive as the Signature Series, but that can be attributed to the significant drop in price.

Hi everyone, long time lurker - first time poster. I'm changing the oil on my 2005 Subaru Legacy GT. I bought the car last November with ~65k miles. It's stage 2 with 300whp on an OEM turbo. Owner was running M1 0w-50 racing oil, I replaced it in late November with RP 5w-30 cause there was an...