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i've had this discussion with a honda tech 2 days ago and this is their reasoning behind 5w20. This tech told me since the clearances on the rod and crank bearings is getting so tight that using thicker weight oil will not properly lube the area inbetween the bearings and the crank. I originally suggested i switch to 10w30 to keep from buring so much oil. the tech told me they are expecting 1 quart of oil burned for every thousand miles if the motor sees its redline on a healthy regular basis. stick with 5w30. you may burn oil too quickly if you switch to 5w20
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