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Engine oil grade


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My 2007 Impreza wrx 2.5 is due a service. Last year I used 10w40, which I initially thought was quite thick but have had no issues with. My question is what do you guys recommend in terms of engine oil grade? The car is on 110 000 miles so the thicker oil may help it but I have seen people use 5w30 as well. 
Any help appreciated 


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I always use 5w30 as that is what it specifies in the owner's handbook. Never had any issues. I change it every 5000 miles. Care now on 125k miles.

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