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I would start with the compression test first, but it might just be normal with the way your running the car and that oil. I have seen some oils burn like crazy and others not.
Nopone ever believes me but Ive used Mobel 1 5w 30 in the winter and 10w 30 in teh summer. Ive used it on all my motors with no issues at all. Everyone says oil consumption is an issue wit Mobel 1 but Ive never seen it. Every block weve torn down of mine (even my 100k block) that was used with Mobel 1 had no signs of terriable wear or sludge of any kind.
On a side note, I will be using Rotella T 15w 40 on my 04 when the EJ22 goes in her!
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