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Message: <blockquote data-quote="vermilion" data-source="post: 851697" data-attributes="member: 9891">if building a FRESH ENGINE:use conventional oil to prime and get to operating temps. around 185*(do not let it overheat) for 10-15 minutes. id also recommend an aftermarket oil pressure gauge to keep accurate oil pressure. do not allow operating below 20 psi. after initial start up change the oil again. then change oil 250 miles then 500, 1500, then 2000. after the 2000 mile mark you can use synthetic oil. this precautions make sure rings seat, assembly lube dissolves and decreases metal shavings. first cold start should be 75 psi or so. then it will gradually warm up to 25 psi. with 4v h.o oil pump it will go to 100psi then settle at 25psi warm. yes i bought cases of cheap shell conventional 5w-30 for break in process. :crybaby2:</blockquote>