Breakin' in a new motor.

I've searched the archives and found a ton of good info posted on the subject here in the past. I've still got a few questions on some things though.

I fired up a rebuilt SBC and did the whole cam 2500 -3500 rpm thing for about 15 min. thus far. The vitals of the motor are good and everything appears to be working well.

I currently have 10w-30 non-synthetic oil in it. Is this a mistake? Some of the stuff I came across in the archives said that 10w-30 was too slick for the run in process. Is this true? If so, what should I use instead?
I doubt I've destroyed the motor in 15 minutes, but I'd like to do it right. Thoughts?

Thanks,

-r

 

Ha, I heard about you breaking in your firewall flamethrowers too! Its all in the timing my boy.... I have been told to use non-detergent single grade oil to break in a motor as modern oils are to damn efficent at what they do and will not let parts "bed in" during the break in period. This may be bunk but it does make sense to me and I was told this by some old guys (yeah actually older than me) who seem to know their stuff. I'll call you when I get back in town and see how the Caddy is coming along.

 

break in is usaually run on a straight weight oil but i don't think using a multi-grade will hurt any. just don't tr to break in with a synthetic oil! it is just too slick to let the rings seat in to the cylinder walls.

just changa it after the initial cam break in run and again after about 500 miles, along with the feilter.


jerry

 

While I personally try to use non-detergent oil for break in, I've used plain 'ol 10w30 before with no problems. I think you'll be just fine.

 

Alrighty then! Time to wake up the neighborhood.

Thanks for the input.

-r