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Originally Posted by supraman121
I use havoline 10w 30 with deposit sheild, 10w 30 is the type of oil or thickness i think the factory put in them, but i would use a full synthetic 10w 30 unless your burning it or leaking it, castrol should be good, Im still a havoline fan my self but my brother swears he can tell a power difference with the 10w 30 castrol synthetic.
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It has been reported by several sources that switching to a synthetic oil after having used dyno oil for 100k miles is not a wise thing to do.
Primarily due to the syn oil cleaning away the varnish and deposits that build up around the seals, thus causing leaks to develop.
A name brand 10w-30 or 10w-40 would be fine.
PS: Your brother is overly sensitive.