Originally posted by MattC
yeah use 5w30 weight for ur break-in. i ran castrol synthetic 10w30 with honda oem filter, than a ran castrol high mileage 20w50 with honda oem filter.
you are NOT supposed to break in a motor with synthetic. the best would be a non-detergent(ND) cheap oil believe it or not. it is not as 'slippery' as synthetic and will shorten the break in process as opposed to synthetic.