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09-16-2016, 06:28 AM
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Join Date: Jul 2007
Location: Santiago, Chile
Posts: 447
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changing oil hot or cold???
Hi All,
I have always changed engine oil on my RV-8 after flight so the engine is hot. Yesterday I was talking with an inspector from Chilean FAA and he told me why you do that, is there any lycoming SB, SI or recommendation that said the engine should be hot for changing oil?, so I said yes, then he told me show me a document. I have been searching and I can find any recommendation about it.
Please help 
__________________
Fernando Abasolo
Santiago Chile
SubSonex waiting for tailkit to arrive 
Flying phase II RV-8 (SCSE) Serial Number 83290, Tail Number CC-AJC
Flying RV-8 (SCTB) Phase II 600 hours and counting since February 22nd 2010
Serial Number 82727, Tail Number CC-PXG
Lyc. IO-360, Hartzell Prop
VAF #2056
EAA Member 774981
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09-16-2016, 06:47 AM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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In the summer, I'll just drain the oil without running the engine first. If the outside air temps are warm enough (80? F / 27? C) the oil drains just fine without any addition coaxing.
In the winter, in Minnesota, doing the same thing would result in the oil taking days to drain so during those times I'll fly for an hour or so then drain the oil afterwards while it's still nice and hot.
__________________
Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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09-16-2016, 07:25 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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I'm not aware or any Lycoming, or FAA document for that matter, that recommends running the engine prior to an oil change to warm up the oil. Lycoming SB 480E, Oil and Filter Change and Cleaning, only states when and what to inspect, not how to do it. Nor does it say to do so in my Lycoming operators or maintenance manual (to be fair I only have the manuals for a 540).
So why do a lot of us do it that way? It boils down to sort of a best practice for 2 reasons:
1. Warm oil drains faster than cold oil
2. More importantly, IMO, running the engine and warming the oil will maximize suspension of contaminates in the oil that we want to remove from the engine
Is it mandatory or actually necessary? In my opinion, nope. But I will continue to do that way. YMMV....
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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09-16-2016, 07:33 AM
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Join Date: Dec 2007
Location: Conyers GA
Posts: 347
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Better drainage
Some feel that warm oil will drain more completely. However we still have about a quart in the oil cooler that never drains. So at oil change we never get all the old oil out
Gary Specketer
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09-16-2016, 07:40 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
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Quote:
Originally Posted by Auburntsts
So why do a lot of us do it that way? It boils down to sort of a best practice for 2 reasons:
1. Warm oil drains faster than cold oil
2. More importantly, IMO, running the engine and warming the oil will maximize suspension of contaminates in the oil that we want to remove from the engine
Is it mandatory or actually necessary? In my opinion, nope. But I will continue to do that way. YMMV....
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THIS is the primary reason to drain the oil when it is hot.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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09-16-2016, 07:49 AM
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Join Date: Dec 2009
Location: Montreal
Posts: 1,456
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yes, it's the only way to get the sludge out. You are leaving a bunch of **** in the engine if you drain it cold. It's kinda like mud and it just collects there in the corners.
__________________
Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
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09-16-2016, 08:14 AM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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Quote:
Originally Posted by Auburntsts
More importantly, IMO, running the engine and warming the oil will maximize suspension of contaminates in the oil that we want to remove from the engine
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I have a filter on the engine that does this for me when the engine is running. Not sure how much difference draining the oil when warm would actually make. Haven't found any significant amount of sludge in ~650 hours either, so who knows?
__________________
Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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09-16-2016, 09:19 AM
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Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 671
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I just changed oil yesterday after running the engine first. When I removed the filter, it was full of oil and made a bit of a mess. Does most of that oil drain out of the filter if the engine is not run prior to oil change? John
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09-16-2016, 09:21 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by jpowell13
I just changed oil yesterday after running the engine first. When I removed the filter, it was full of oil and made a bit of a mess. Does most of that oil drain out of the filter if the engine is not run prior to oil change? John
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No. Some, maybe, but there will always still be quite a bit in the filter unless you have an angled oil filter adapter.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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09-16-2016, 09:25 AM
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Join Date: Mar 2008
Location: Anacortes, WA
Posts: 823
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warm oil
It takes forever for cold oil to drain out. PERIOD.
__________________
Steve Lynn
RV-7A
Flying Phase I
Anacortes, WA
www.mykitlog.com/sglynn
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