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I guess you can win an argument over the internet. Link to comments on my VOA on 10w-40 Castrol GTX

The shearing of this oil from a strong 40 weight (73.8 viscosity) to a strong 30 weight continues. Others had mentioned that this might lead to coking in the turbo. With that in mind last oil change and continued with this one I have begun adding a 2oz treatment of Auto-RX. This is the first...

This one had been sitting on my shelf for 3 months before I sent it in with my most current one from February. This was the first time for me to run a 2oz preventative maintence treatment of Auto-RX. Also the car was performance tuned (ECU reflashed) during this UOA. Past UOAs can be found...

Originally it fit my need for a dino oil for break-in, met manufacturer’s warranty requirements, and was stout enough to handle track and spirited driving in the Texas heat. Sine then the car has become a daily driver despite my original intentions and the short trips necessitate frequent oil...

Air leak somewhere is possible although it would have to be before the MAF since the car experiences no driveability issues. Car does get short driven a bit despite my best intentions.

Never got around to posting this one. I'm expecting another two coming shortly from Blackstone as well.

I changed up the naming scheme for my UOAs. Since we can't edit orginal posts here is the orginal graphic for historical purpo

I changed up the naming scheme for my UOAs. Since we can't edit orginal posts here is the orginal graphic for historical purposes.

I changed up the naming scheme for my UOAs. Since we can't edit orginal posts here is the orginal graphic for historical purposes.

My main argument against changing to some of the other recommended cheap dino oils is still the fact that they do not meet the warranty requirements set forth by Subaru (primarily the lack of GF-3 approval on 10w-40 oils). And since I'm still well within my warranty period and haven't done...

I ended up taking a trip out of town that I knew was going to put me over the 3k mark on my oil but still be under the 3.5k that Subaru recommends. However I managed to leave my $500+ subscription sunglasses at pretty much the northern most portion of my journey. I decided it was better to...

Another thing to keep in mind is who is raving about the tires. A good AutoX tire does not always mean a good HPDE tire and vice versa. Some of the best bang for the buck AutoX tires turn into half day wonders at the local HPDE as they turn into slick masses of goo due to the continual heating...

The oil consumption you are seeing is "normal". Or at least that's what Subaru is saying. (Apparently 1qt every 1k miles is normal by Subaru standards.) :rollyeyes: There are enough threads over at Nasioc that talk about "heavy" oil consumption on the 2.5L turbo engines that it isn't just a few...

Something to remember that everyone seems to be overlooking is that among the mass market dino oils only the Castrol GTX in this weight met the manufacturer warranty requirements. While it isn't my intention to stir the pot with the 'credibility' of oil certifications, it is an important issue...

Since everyone seems to think I’m a nutter here are a few things to put my decisions in perspective. Subaru says the factory fill should be changed at 3k with 1k of that as break-in. While it looks like Subaru may use some special oil (it may be a special oil with lots of Moly in it or it could...

VOA of oil can be found here .

Here is a VOA I had run on the Castrol-GTX 10w-40. http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=11;t=000287 I just changed my oil last night for the first time with that oil so expect a UOA on it in a few weeks.

Each engine is different. My pickup while specced for 87oct gets enough better fuel mileage with 93oct to justify the cost as long as the price difference is less then aprox 25 cents. You won't know what's best for your vehicle until you run fuel mileage logs for both fuels. And remember it can...

I'm currently running this in my Forester XT so should have UOA on it in about 2.5 months.

I've been thinking about the oil thinning reported from Blackstone. I wonder if the fact that the oil by this time had been in the car for 9 months has anything to due with this. I looked at the door panel identification plaque and was surprised to learn the vehicle was assembled in 5/04! It...