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Is funny because the M2 recommends the 40W oil... Really not sure why Blackstone would reinforce the thinner oil ... Let alone the 10k commentary.
Personally, I run the 5/40 (M240 - B58 Engine) as my engine ain't seeing extreme cold temps. And if it does, I just refrain from running the engine then, no harm, no foul. But the engine seems to like it better than the thinner oil, is quieter, lol. Moly use is smart, I do too... Also seemed to quiet the engine down a bit after putting it in. I'm due to drop my oil soon and send it out as well, will look for this thread and share. Probably share the new and old BS Report for comparison.
Good Luck!
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