mstow42 said:37k miles.
STIGR-Wagon-Dad said:On BITOG, everyone is saying that a all of 0W30 and 5W30 that are resource/energy conserving shears down to a 20 weight by it's formulation. Subaru specs 5W30 and consumption of 1 quart/1000miles, sounds about right with the spec'd oil. Also, Subaru also mentions the use of heavier oils is recommended for severe conditions. I would switch to a oil that is not resource/energy conserving like Shell Rotella T6 5W40 or German Castrol 0W30.
STIGR-Wagon-Dad said:straight from the book. Subaru's way of words to confuse the end user.
i have never seen a 10W50 or 20W40. you can use 5W40 oil.
If the vehicle is used in areas with very high temperatures or for other heavy duty applications, the following
viscosity oils must be used: API standard: SM or SL
SAE viscosity No.: 30, 40, 10W-50, 20W-40, 20W-50
also note that it says the same thing in my sti service manual.
STIGR-Wagon-Dad said:I use Mobil 1 0W40 and it looks to be the standard to measure up to on BITOG. A lot of people use Shell Rotella T6 5W40 especially in the STI's because it's cheap, readily available at walmart, and it does well in oil analysis when used in daily driving and racing. Some STI's have gone up to 6k miles oil changes with success. Plus you'll read plenty of good reviews on the net. I would buy some T6 but it's not available in Guam, but I can get the Mobil 1. It's a good choice for me as Guam's temps are in the 90's and high humidity year round, a lot of stop and go with plenty of hills.
From the all the data I've read on BITOG, M1 has the slight edge in additives, Rotella has the advantage in price. Rotella is definitely bang for the buck.LORE BECA said:Our weather in Summer also runs high 90's to 100 and humidity is 87-90%. is Mobil 1 40 weight about the same a Rotella or is MO 1 SYNTHETIC BETTER?
cowboy said:STIGR is right.......it will take a couple oil changes for your engine to get accustomed to the German Castrol.......and it seems that you are better off now with 1/4 quart vs 1 quart that you were stating....also, I found that GC expands as it gets hot like transmission fluid, so always check your oil when the engine is hot; you really might not be low on oil....
maxse03 said:My 05 STi used about 1 quart every 1000 miles and so does my 08 Tribeca on 5w-30. After switching both to Royal Purple 10W-40, the problem pretty much went away. At least I don't have to add between oil changes.
Just some reading: http://allwheeldriveauto.com/why-does-my-subaru-use-oil/