what is special about specific break-in oils?

[friendly_jacek]

such as this: Royal Purple Break-in Oil

Anyone saw VOA/UOA on those?

 

[Thax]

Usually lots of ZDDP

 

[SteveSRT8]

These are almost always high zinc oils. That's it.

 

[JR]

nothing special conventianal mineral oil, with high zddp level. i use delvac 1300 15w40 w/ comp cam additive.


kc

 

[friendly_jacek]

Thanks!

I found some more info with several VOA (scroll to the bottom):
http://www.carcraft.com/techarticles/ccrp_1108_camshaft_break_in_guide/viewall.html

The general theme is high ZDDP, low detergents (but there are exceptions).

Thus, diesel oils with high detergents are not ideal, but probably not enough to matter much.

 

[mechtech2]

There are also break in lubes and pastes with high Mos2 [moly].
Honda has used original engine oil fill oil with high Mos2, also.

 

[artificialist]

Typically they are within the SAE 30 viscosity range unless otherwise noted.

The other things noted are true as well.

 

[A_Harman]

There are different types of zddp. Some take longer to break down due to heat and coat the wear surfaces. There is a page on Joe Gibbs Driven website that describes the difference between slow-burn and fast-burn zddp. Break-in oils should be low detergent, and have fast-burn zddp so that the wear-protective layer can be built up as quickly as possible in a new engine.

 

[CATERHAM]

Take what Joe Gibbs Driven says with a grain of salt.
As far as I know, all PCMO use the fast-burn ZDDP and most HDEO's today do so as well.