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My local Autozone stopped carrying GC 0w30. I always used this oil because it was readily available and seemed to work best in my 02 Subaru WRX. The other full synthetics I've tried such as M1 5w30,10w30, and 5w40 T&S had a somewhat of a consumption problem whereas the GC 0w30 did not. Looking...

I have an 02 Subaru Impreza WRX (2.0L Turbo) with 45k miles and have been using Mobil1 5w30 for a while now. I have to add about 2+ quarts over the 5000mi oci. Some of the other WRX owners seem to have the same problem with M1. The consensus is that M1 is one of the thinnest 5w30 oils you can...

Rank the fully synthetic oils from best to worst that you would find at a typical Walmart. Best means best protection, performance, and value (regardless of grade). How do the more readily available oils stack up against each other?

I have a strange oil problem. My car does not use a drop of oil normally, but if I start driving really aggressively (say 5+ WOT runs to redline in a few days) I can lose about a quart in less than a week's time. The weird thing is, although I might be imagining it, this problem seem to only...