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08-15-2009, 02:00 PM
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#1
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Senior Member
Workhorse Chassis Owner
Join Date: May 2009
Posts: 207
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replace oil with synthetic at 21000 miles?
Would like to have synthetic oil in my engine but I have been warned I may get leaks. I have 21000 miles (5500 in past two months).
Opinions please.
8.1 Vortec engine
__________________
Sam Leonard
2004 National Seabreeze 8321LX
W-22
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08-15-2009, 02:27 PM
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#2
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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Quote:
Originally Posted by Samflhomes
Opinions please.
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I say the leaker theory doesn't hold water. Go for the synthetic oil! 
I transitioned at 15,000 miles. You're good to go!
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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08-15-2009, 10:33 PM
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#3
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Senior Member
Workhorse Chassis Owner
Join Date: May 2005
Posts: 672
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I switched over to synthetic oil (Mobil 1) with about 20,000 miles. No problems with any leaks.
__________________
Fred Kennerson
2003 Dolphin L/X 6320
Yucaipa, Ca
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08-15-2009, 10:35 PM
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#4
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Senior Member
Appalachian Campers Coastal Campers
Join Date: Jul 2006
Location: Conway, SC
Posts: 828
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I changed to synthetic at 14,000 miles. No Leaks. Poppycock
__________________
2002 Winnebago Ultimate Advantage 40J, Roadmaster InvisiBrake Model 8700
2012 Chevy Captiva
NEVER FORGET
"Everyone Goes Home"
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08-15-2009, 10:45 PM
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#5
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Jun 2008
Location: Glendora Ca.
Posts: 1,589
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Mine started life 10,000 miles ago with mobile 1. No leaks.
Oh that is engine number 2..
Mike
__________________
2004 Monaco Monarch
Blueox, SMI, 1990 Wrangler YJ
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08-16-2009, 12:14 AM
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#6
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Sep 2007
Posts: 2,976
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Quote:
Originally Posted by Samflhomes
Would like to have synthetic oil in my engine but I have been warned I may get leaks. I have 21000 miles (5500 in past two months).
Opinions please.
8.1 Vortec engine
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I installed AMSOIL 5w30 synthetic oil at 8500 miles. my engine has not leaked any oil. 
__________________
01 WINNEBAGO 35U W20.8.1L 5sp allison SW Wa,. Good Sam, SKP. RVM 198 AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. Michelins, TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '21MB GLA FWD on dolly
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08-16-2009, 05:13 AM
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#7
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Senior Member
Workhorse Chassis Owner
Join Date: Feb 2005
Location: Anderson, IN
Posts: 476
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I switched to Mobil 1 at 5,ooo miles and have had no leaks. I change at 5k as well and have to add less than a quart between changes. The last time I sent in a sample the report said the oil could have been used longer before deterioration.
Dave
__________________
2004 37B Adventurer, 8.1 WH, Ultrapower, DIY CAI, Henderson Track Bar, Tru Center, Koni FSD's, Roadmaster Even Brake, Scan Guage II, 180 Thermostat,
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