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    M1 0w40 FS vs Shell Helix Ultra 5w40

    Hey guys, I noticed Shell Helix Ultra is seldom discussed here. I'm just wondering whats the difference between the 2 besides one being SP and the other SN. I've personally used both, Shell Helix Ultra 5w40 (SP) version and M1 0w40 FS. I'm going for my next oil change and the place where I...
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