Any consensus for break-in oil? M10 lower end rebuild

[E39guy]

I rebuilt my M10 and its going to be time to fire it up soon. I'm comfortable with break in procedures etc.. but wanted to know what you guys were using for oil. 

 

Thanks, 

 

Evan

[John_in_VA]

It was recommended that I use a 30W non-detergent oil back in 1992.  These days the Joe Gibbs break-in oil is one of the favorites, but "Search" will uncover the earlier discussions on this topic.

https://www.summitracing.com/search/product-line/joe-gibbs-driven-br-break-in-motor-oil

[E39guy]

Thanks for the info.. looks like Lucas makes a dedicated break in oil as well. I wasn't aware such a thing existed!!

[TobyB]

As long as you use a break- in oil that says it's for flat tappets, you're golden.

 

1992 oil is very different than 2017 oil.

 

t

 

[John_in_VA]

1 hour ago, TobyB said:

1992 oil is very different than 2017 oil.

 

The bottle looks the same!

[achman]

I use valvoline VR1 racing oil, it's high zinc for the flat tappet people

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[jgerock]

5 hours ago, achman said:

I use valvoline VR1 racing oil, it's high zinc for the flat tappet people

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If you google this- be prepared to spend lots of time reading.  I am using Royal Purple break in oil in my 69.

[Mike Self]

Old School Guy that I am, when I rebuilt my '73's engine back in 2004, per the machine shop's suggestion (since it wasn't a high performance engine) I used plain ole Pennzoil 20w-50 for the first thousand miles (round trip to Vintage) following the normal break-in procedures, then switched to 20w-50 or 15w-50 synthetic.  I was told not to use synthetic for break-in miles as it was too slippery and wouldn't allow the rings to seat properly, thus the dino oil at first.  

 

50k miles later, all is well--virtually no oil consumption between 8k mile oil changes, and no smoking...so it must have worked.

 

mike

 

[arminyack]

http://www.amsoil.com/shop/by-product/motor-oil/racing/break-in-oil-(sae-30)/

[TobyB]

Quote

back in 2004

Right before the formulations changed...

 

It's not guaranteed to be a problem- in fact, the low- zddp probably works most of the time.

 

It's just that 4 quarts of  the right break- in oil costs about $10 more at most- why would you NOT?

 

t

 

[E39guy]

Since I am reusing cam and followers I doubt I have any trouble, but it seems like cheap insurance so why not. 

[Zorac]

i used brad penn green for the first 1000km, then went to rotella t.

[achman]

It must be good, it's "not legal for street use"

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[lilmo]

Spaten Optimator  

[E39guy]

10 hours ago, lilmo said:

Spaten Optimator  

 

Haha!! I had a run-in with that stuff on tap locally years ago. Really snuck up on me!