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I've been using RLI BioSyn 5W-40 with great success. I have oil reports for everything that I have drained from my '05 Subaru STI other than the factory fill (which I drained at 400 miles). The last 3 reports have been through Dyson. http://www.bescaredracing.com/sti/oil/analysis/ Tim

This might also help explain the lead: An analysis of pure torco concentrate. I pulled this from a post on NASIOC. I do not take credit for this: For reference and for credit, here is the original post from NASIOC: http://forums.nasioc.com/forums/showthread.php?t=1448046 Tim

Originally Posted By: Last_Z Maybe it's my ignorance showing, but I don't see an "amazing" report anywhere in this thread! That's coolio. I'm just happy that my motor is doing 'ok'. I'm happy with the results given how I have driven the car for the past 3000 miles and compared to my previous...

Originally Posted By: Last_Z Off topic a bit; Quote: As the turbo spools, huge amounts of air rush past the MAF sensor. The ECU registers this as air ingestion. However, it is simply not true. The first quote is not technically accurate. Air passing through the MAF is read and the data is...

Originally Posted By: buster I don't want to be the negative one here, but there is only 3,000 miles on the oil. It should be in good shape. I wasn't aware of all the mods. That's easy to say since I didn't indicate how I drive my car and how much WOT this beast sees :) It gets plenty of...

For the record, yes, I have modifications to my car. Here are the ones that matter. 70mm (big) MAF (APS CAI) Front Mount Intercooler (APS DR525) Nismo/JECS 730cc injectors Walbro Fuel Pump Turbo-Back Exhaust (APS R1 TBE) GM Boost Control Solenoid Custom Tuned by me using Cobb StreetTUNER and...

Terry was really happy with this report given the 2% dilution. This shows how awesome RLI BioSyn 5W40HD really is. I am not worried about the copper whatsoever due to what I learned from Terry. Take a look at the other wear items. Pretty darn good. Needless to say, at this time I am a huge...

Dyson Analysis. Thanks Terry! With ~2% fuel dilution, this is amazing (IMHO). I can't imagine not running this stuff. Tim

Andy, Sorry I didn't see this sooner. I just posted my UOA and ran across your post. 1) Cobb runs leaner than stock. I have verified this on my own wideband. Stock ran in the high 9's AFR. Cobb ran in the low 10's AFR. 2) Fuel in the oil is expected if you never take long trips. When I lived...

I know people don't want outside links for data. However, I don't intend to ever get rid of my domain (unless I am dead). So, if the link doesn't work then check back in an hour or two. http://www.bescaredracing.com/sti/oil/analysis/12400.JPG This is my third UOA using Mobil 1 RACING 0W30...

I didn't know how the M1R would perform in my car. I did a 2500 OCI with a TBN. That led me to believe I could go longer. I went to 3000. Now I think I can go to 3500. I do things slowly. So, I'll slowly increase my OCI. However, I won't go much above 4K. I drive the car hard and, honestly, my...

I know that this oil isn't good for cats. Zinc and/or Phosphates + Cat = bye bye kitty. However, I have 5500 miles on this oil through an aftermarket cat. I have pictures of the cat before I installed it. I will get pictures of it again after I temporarily remove it (need to do some testing with...

This is my second fill and my second UOA for Mobil 1 Racing (M1R, 0W-30). The first one had a 2500 OCI. This one I carried out to a 3000 OCI. Results are awesome. I wasn't expecting things to look this good considering that I have beat on the car pretty good the past 3000 miles. I know I am...

Yea - IMHO, a 20 wt oil is too thin for a turbocharged daily driven scooby. These motors like it a little thicker! JMHO though! t

I wanted to do a couple quick dino oil changes right off the bat to get all the gunk out of the motor. Then I had a bad batch of dino that made the engine make some really horrid noises on cold startup (not the usual Scooby knocks) so I swapped to M1 0W-40. Then I got interested in M1R. I wanted...

bigpaulo, Thanks for the comments. I actually swapped to synthetic BECAUSE of the onset of cold weather. In fact, I swapped to Mobil 1 0W-40 I changed it out for M1R because I wanted a thinner oil to help with the short trips AND because I wanted the extra protection that the M1R will give...

Sorry for this crosspost - but browsing these forums I haven't seen many UOAs of Mobil 1 Racing and I wanted to share mine with the group. http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=3;t=002568 Tim

2005 Subaru WRX STI. 5650 miles on car. 2500 miles on this oil fill. I'm hard on this car. I drive 2 miles to work. 2 miles home from work. 1 mile to the gym and 1 mile home from the gym. Lots of short runs. My oil temp only gets to 170 by the time I get to work. I upgraded to a Cobb Stage II...

Hey Guys, I have a bud with a brand new 2005 4Runner. He's getting ready for his first oil change (500 miles to ensure all the initial wear metals get purged). He asked me about synthetic and I advised him to stay away from synthetic until at least 3K miles. Curious as to what you guys would...

Ahhh. So basically with the amount of Zinc and Phosphorous it doesn't even come close to fitting into an API category ... thus, it can't be tested. That makes sense. Thanks!