oil and length of time for break-in

[Matt]

Hi everyone. I have been running straight SAE 40 mineral oil since I had a
cylinder replaced. That was about 15 hours ago. My A&P says that I should
think about switching to AD now. The general wisdom has been that switching
to AD after break-in should be done after 25 to 50 hours.

Since only one cylinder has been off, I don't think I would notice a
difference in oil consumption when the rings on the new cylinder are seated.
Should I just make the switch now or wait a bit longer?

Thanks

Matt

[The Visitor]

You're going to ignore you mech for our advice?

Since it was just one cylinder, I vote with him.

Aw, okay....."him/her"

John




Matt wrote:

> Hi everyone. I have been running straight SAE 40 mineral oil since I had a
> cylinder replaced. That was about 15 hours ago. My A&P says that I should
> think about switching to AD now. The general wisdom has been that switching
> to AD after break-in should be done after 25 to 50 hours.
>
> Since only one cylinder has been off, I don't think I would notice a
> difference in oil consumption when the rings on the new cylinder are seated.
> Should I just make the switch now or wait a bit longer?
>
> Thanks
>
> Matt
>
>

[Matt]

"The Visitor" wrote:

> You're going to ignore you mech for our advice?

Ignore? No. But I am sure there are as many opinions on this issue as
there are A&Ps. Just looking to bounce his idea off of others.

Matt

[Matt]

"Gene Kearns" wrote:

> Compression? Appearance of plug? Exhaust stack on that side?

Understood. The lower plug on that cylinder had fouled out with oil past
the rings after about 2 hours. Cleaned and replaced. Since then there has
been no problem.

Have not done a compression check since I do not have the equipment.

Thanks for your input.

Matt

[The Visitor]

Matt wrote:
Just looking to bounce his idea off of others.
>


Well I think it would be okay but if you have a high oil consumption,
suggesting it isn't sufficiently broken in, then you will be changing
back. Is oils consumptions stable??? At least 500 hrs on your engine?

John

[Paul kgyy]

Depends to some extent on cylinder walls - Chrome often doesn't seat
until 25+.

I'd follow your mechanic's advice, but would still use high power
settings to make sure everything seats properly.

[[email protected]]

follow the manufacturers recommendation.
What I've read lately it doesn't make any difference.
Use whatever makes you feel good!!


Paul kgyy wrote:
> Depends to some extent on cylinder walls - Chrome often doesn't seat
> until 25+.
>
> I'd follow your mechanic's advice, but would still use high power
> settings to make sure everything seats properly.
>