Factory fill & break-in grades

[StevieC]

??? Don't know... That's just what it says, so that's what I did. Car doesn't use a drop of oil even when I tried 0w20 and I have over 150,000KM on it now.

All my other car manuals never said this, all they said was to drive it gently...

Maybe they do a Ring-Seating at the factory and this procedure is to set other parts??? Not an expert.

 

[OrdnanceMarine]

FWIW I suspect that Honda used a 5w20 as the factory fill on my Civic Si since it showed up so thin on my first UOA. 5w30 is what's recommended by the factory. Perhaps they would like a little extra ring/bore contact to polish up both early on during break in. I'm almost ready for my second oil change and did some work on the dyno and occasionally drive the engine pretty hard up to 8600 RPM so I'm interested to see what kind of wear shows up.

2008 Civic Si Factory Fill UOA

 

[Malo83]

X3

done this to all my new cars.

 

[afoulk]

My jeep's owners manual said to vary speed, and to use short, full throttle bursts every once in awhile, but keep it under 50 or 55mph for the first 500 or 600miles I think it was. I think the speed limit part is mainly for the break in of the differentials on most cars.

But I do agree that most any engine should be worked hard to break it in and get the rings to seat. I rebuilt a 60series detroit, and the shop manual even gives you a run in procedure for it that involves running the truck on a dyno. Unfortunately, we aren't a Detroit dealer, so we didn't have the dyno to run it on, so the thing gave off a pretty good blue haze out the stack, but now that the customer has been using it a few months, its starting to break in, and the haze has cleared up.

 

[OrdnanceMarine]

Looks like we keep changing this into a "Which break in procedure is best" instead of what the OM asked for which was, "Do manufacturers use the same grades as their Owner's Manual recommendations?" and, "Is a thinner or thicker grade (or oil within grade) preferred during the early stages of breaking-in an engine?"


Let's bring it back.