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#1
December 11th 05, 10:22 PM
posted to rec.aviation.owning
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oil and length of time for break-in
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 
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#2
December 11th 05, 11:43 PM
posted to rec.aviation.owning
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oil and length of time for break-in
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
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#3
December 12th 05, 01:03 AM
posted to rec.aviation.owning
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oil and length of time for break-in
"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
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#4
December 12th 05, 02:52 PM
posted to rec.aviation.owning
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oil and length of time for break-in
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
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#5
December 12th 05, 02:56 PM
posted to rec.aviation.owning
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oil and length of time for break-in
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.
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#6
December 14th 05, 03:27 AM
posted to rec.aviation.owning
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oil and length of time for break-in
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.
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