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Posts: 1
Join Date: Jun 2009
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Oil capacity question -
11-20-2009
, 09:18 PM
Specs all say Xfires take 8.5 qts oil; but at 8 qts dipstick reads full. Query whether or not to add that extra .5 qt. --B4114
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Senior Member
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Posts: 2,815
Join Date: Jan 2008
Location: North Plains, OR
Age: 60
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Re: Oil capacity question -
11-20-2009
, 09:27 PM
When the dipstick says full, stop adding..... 
2005 SRT 6 SSB coupe - SL55 intake w/K&N filters, TVT intake tubes & NW devil horns, slotted front rotors, Goodridge SS lines.
2005 SRT 6 Aero Blue coupe 11.96sec @ 113.9mph 1.72 60ft
Mustang dyno: 325rwhp, 343trq
DynoJet dyno: 359rwhp, 348trq
LET ECU tune, LET 181mm pulley, LET HE, NW Dual CAI, NW pulley kit, NW catch can, C32 calipers & rotors/DiskItalia TK pads, Goodridge SS lines, mod'd Intake Mani's(240's), separated IC cooling, CM30 IC pump, JR pillars & gauges, Zeitronix Zt2.
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Senior Member
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Posts: 2,019
Join Date: Apr 2006
Location: Caledon,Ontario
Age: 70
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Re: Oil capacity question -
11-20-2009
, 11:41 PM
Quote:
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Originally Posted by Bladerunner4114
Specs all say Xfires take 8.5 qts oil; but at 8 qts dipstick reads full. Query whether or not to add that extra .5 qt. --B4114
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If you were to take a brand new engine, add oil to the full level on the dip stick, then run the engine and recheck the oil level, I am sure that you would have to add oil to bring it back up to the full level again.
Not all of the oil would drain when the plug was removed as oil would be adhering to the inside of the engine, inside the oil ways, hydraulic lifters and in small puddles throughout the engine etc. I am sure that a pint of oil could easily be left inside the engine in this manner.
You may put in 8.5 qts at first but you would not put that in the next time.
What is the difference between Mechanical Engineers and Civil Engineers?
Mechanical Engineers build weapons and Civil Engineers build targets.
Cheers !
2004 Coupe
Black, dark/medium slate interior, 6 speed.
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Senior Member / Moderator
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Posts: 8,720
Join Date: Jul 2007
Location: Aurora , ILL
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Re: Oil capacity question -
11-21-2009
, 02:06 AM
8 Quarts fills mine perfectly every time and I change my own oil.
Mobil1 0W40
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Senior Member
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Posts: 1,589
Join Date: Apr 2008
Location: Orlando, FL
Age: 56
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Re: Oil capacity question -
11-21-2009
, 07:22 PM
1 thing people are overlooking is that the oil filter is on top of the engine, meaning that when the car is off, it all drains down. So it may show as full with only 8 quarts with the filter being empty. 
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Senior Member
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Posts: 2,019
Join Date: Apr 2006
Location: Caledon,Ontario
Age: 70
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Re: Oil capacity question -
11-21-2009
, 11:02 PM
Quote:
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Originally Posted by Mimi05SRT6
1 thing people are overlooking is that the oil filter is on top of the engine, meaning that when the car is off, it all drains down. So it may show as full with only 8 quarts with the filter being empty. 
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As the oil is checked with the engine stationary all the time using the dipstick this really proves nothing. I stand by my statement in post #3 but specifically add oil trapped in the filter. The line from the oil pump I believe is fitted with a one-way valve, so oil past that point is trapped except oil that is subject to gravity which pulls it beyond the filter and joins the oil subject to the leak down. As air has to enter the lines to replace the oil, the leak down of oil could take a very long time and not be apparent at the dipstick until much much later.
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