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Originally Posted By: bluesubie Wow, the RL sheared and the RP (no surprise) sheared. Are you running any mods? RonJitsu (I think that's his screen name here) and I are running nearly 8k intervals with Amsoil (and me previously with GC). There's a very good uoa here somewhere from a protuned...

Originally Posted By: d00df00d Again, no way to tell unless you try. However, I think we can make a safe bet: - Royal Purple is known to shear sometimes - Red Line oils are known to be very shear stable in general - Red Line 10w-40 in particular is one of their stoutest oils I would definitely...

Also, is THIS the right M1?

Originally Posted By: d00df00d There should definitely be a fuel economy difference. The question is whether you'd notice, and you'll get answers either way on that. The only way to know for sure is to do a LOT of testing. You always want the thinnest oil that'll do the job. Start with the...

Since they are the same price would RL 10w40,15w40, or 15w50 work just as well? Also, would gas mileage go down much more with the 15w50 vs 10w40? Just for the heck of it, what about RP 15w40? Since I do change my oil a bit earlier than most would it be worth trying that first since it slightly...

Originally Posted By: d00df00d Originally Posted By: DARKSTI I am also a little hesitant to use M1 as there are have been some problems with spun bearings using it, although it seems it to be mainly the 5w30 weight... Those claims are vapor. People beat the [censored] out of their cars and/or...

Originally Posted By: addyguy M1 15W-50 would be fine, right down to below freezing. In reality, it is probably actually a 10W-50 oil; but that grade gets confused with MC oils, and the horrible multi-visc's of the 1970's (15,000-mile STP 10W-50, anyone? Or how about Shell 'Fire and Ice'...

Originally Posted By: JoeFromPA Fair enough. Royal Purple 10w40's flashpoint, per RP's website, is 400 F. It's starting viscosity is 14 cst 100 c, and 75 SUS 210F. In an engine like the STI (known for fuel dilution and hot turbos), I'd want an oil with a little more robustness personally...you...

Originally Posted By: JoeFromPA DarkSTI - If you want super-duty oil suitable for your temps, try M1 15w50 :) I'm gonna run it in my 08 LGT next OCI, see how it feels and what a UOA says...especially since it won't be going under 60 degrees for the next few months. Originally Posted By...

Originally Posted By: ARCOgraphite 2HP/Cu-in can do a job on an oil, If this was a Chevy small block V8, it be making 700HP so, I dont think I'd put PP in this beast - Super premium stuff only. Does that leave out RP too?;) Interestingly enough I was using PP 5w30 until about 60K since I had...

Originally Posted By: addyguy Good call on the OCI if you're under warranty. If you're not, run the oil longer, OR switch to something cheaper - RTS 5W-40 does well here. In your previous run, I'm really, really suprised to see Redline shear down so much in 2500 or so miles. I am not under...

Originally Posted By: FZ1 Looks good. Bet you could try PP with similar results and less $. Don't forget to change the AF. I am going to replace the air filter in the next few days, it does get dusty around here

Originally Posted By: d00df00d You can still go hard, just don't go WOT. If you feel the pedal hit the floor, back off a tiny bit. BTW, don't take what I say as gospel. I'm reasonably confident saying it, but really I'm just guessing based on general info. I would run it by some real experts to...

Yeap, I do go WOT quite a bit, but mostly around 75%-90% lately to try and up my gas a mileage a bit. Thanks for explaining the ECU bit and the fuel dilution also :) I will try and not go as hard to see what happens this go around. Originally Posted By: d00df00d Originally Posted By...

Originally Posted By: d00df00d Looks like you've got big fuel dilution. Lots of short trips? A mix, about 40mi every day or so and sometimes 20mi, this also included a trip to San Francisco which was about 500mi total. I also drive in the mountains often and I have a bit of a lead foot on...

Originally Posted By: ZZman Looks pretty good but for a premium oil it was a waste to only run it 3600 miles. It did have a borderline low viscosity for such a short run but I believe RP tends to shear. I try to stay with the recommended interval of 3750mi that Subaru recommends since there was...

Previous oil was Redline 5w30 with a Bosch filter. This was with a the black Tokyo Roki OEM filter. Previous report: http://darksti.com/UOA/AWDJT-D64272.jpg

After seeing this I agree something was off with my previous UOA...

Originally Posted By: bluesubie IMO, stick with the RedLine. The viscosity is probably accurate since it's 9.7 cSt's in 2k miles. It will probably be a 20 grade at 3-3,750 miles judging by other RP uoa's I've seen in subie turbos. Is there any oil with zinc and phos. that low? -Dennis I...

OK I just talked to Blackstone and they agreed the numbers are off and that it doesn't look like other RP samples they have done. Although they haven't run any virgin samples of RP in awhile so I will probably be sending them some to test. The only number that they thought was really off was the...