LT1-LT4 Modifications 1993-97 Gen II Small Block V8

New build break-in

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Old 05-18-2009, 11:55 AM
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Default New build break-in

Got my 355 all together and I'm curious if there is a break-in precidure I need to do and what kind of oil I should run at first to break it in?
Old 05-18-2009, 02:27 PM
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i put cheap 5w-30 in mine let it get to temp then changed it and the filter. make sure to fill the filter with oil first. then i drove around 400miles putting a load on the motor and letting the car engine brake. 7k on it now and dosent leak or burn a drop compression check was good.
Old 05-18-2009, 02:36 PM
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cheap 5w 30 hmmm they made a break in oil but its only for break in. If i remember right its because its high in Zinc and you dont want to run it for extended time. RP makes one
Old 05-18-2009, 04:17 PM
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Originally Posted by BruceBufferTA
Got my 355 all together and I'm curious if there is a break-in precidure I need to do and what kind of oil I should run at first to break it in?
Did you build the 355 or someone else? Just curious.
I have heard of people using Royal Purple break in oil as stated before.
Old 05-18-2009, 04:46 PM
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I used 10-30 valvoline. And ran the car like I rented it.



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