Engine Break in Oil

[CT8]

Originally Posted By: Eddie
How ever; used oil analysis suggest that when you look at the complete engine, wear metals only stabilize after 5-7,000 miles usually. That kind of data indicates that the polishing and burnishing takes much longer than what is commended on above. Piston rings are not the only surfaces that need mating even though the rings don't touch the cylinder walls as some id10t self appointed expert suggested. Ed
If the rings didn't touch the cyl walls they would never seat.

 

[billt460]

Originally Posted By: Oildudeny
Originally Posted By: billt460
I remember when Mobil 1 used to advertise every new Corvette was shipped straight off the assembly line with Mobil 1 in the crankcase.


So what does GM factory fill vettes with now?


I have no idea. My point was it contradicts all this stuff you constantly read about not using synthetics for "break in's".

 

[SteveSRT8]

Every SRT8 6.1 shipped since 2005 was filled with Mobil 1 0W-40 from the factory. Since mine has 110k miles now with no discernable oil consumption I must assume it broke in well...

 

[FCD]

All the engine builders i know do recommend to use only conventional for the first 600 miles or so.

 

[Bailes1992]

I thought all new engines were bed in on some kind of dyno prior to them leaving the factory.

 

[circuitsmith]

Originally Posted By: Patman
My 2018 was supposedly factory filled with Mobil 1 5w30 however the first UOA showed it to have a slightly different add pack than the Mobil 1 5w30 we're used to seeing (it had double the moly and double the boron and half the magnesium)


Carefully parse GM's claim that Mobil 1 is put in 'Vette engines from the factory, and one sees the possibility Mobil 1 is part of a blend.
Race car teams might use a cup of Brand-X oil to meet a requirement for sponsorship, and the rest of the fill with oil of their choice.
GM may use 50% Mobil 1 and 50% special brew for break-in.