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Originally Posted by chulooz
Hmm, I seem to find most of the subie threads I click on have a majority of the people complaining about M1 being too susceptible to burning off. Not sure if its all engines but both turbo and NA models have testified to this. Now I have driven over a rough 1k with NO movement on the dipstick in my 1999 86K 2.5RS using RP.
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Really? My local thread quotes
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I run Mobil1 15w50 Extended Performance oil in my WRX all the time with the built motor. On my stock motor I ran Mobil1 10w30 or 10w40 for track use and street use and was fine.
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i gotta find me some 5w40 full syn juice for winter.. im burning up all my RP.. just threw two quarts of M1 10w30 conventional in there before i actually do an oil change. sigh. didnt burn the M1 but then again i only ran it for ~1000 miles after i bought the car and changed it..
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all i ever ran was Mobil1 full syn, rarely eats any. My older ej25 engine ate oil like no other with syntex, M1 slowed it down quite a bit. stick with dealship filters
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Those are some quotes.
I think, it's all depends on the place you live.