POLAR_JEEP_04
NAXJA Forum User
- Location
- Ohio
ok so im freshing up my 97 4.0 next weekend (rebuilt head, rings, rod bearing, oil pump, gaskits.) and was wonder what kind of "break in" would i have to do if any?
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As far as a break in oil goes, there are a lot of suggestions out there, I used castrol 15w40 diesel oil for the first portion, and 30w diesel for the second. Then I moved to a standard Castrol 10w30 with a zddp additive till I got enough miles to feel comfortable running a synthetic.
hana care to hit wellsville the 7th and/or 8th?