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09-16-2007, 04:19 PM
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#1
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Senior Member
Mid Atlantic Campers
Join Date: Feb 2006
Location: McVeytown, PA
Posts: 2,259
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While attending the Hershey RV show this past weekend, I spoke with 2 service reps that were at the CAT booth. Both reps told me that the C-7 loves 10w/30 motor oil, reason, during cold starts the injectors fire off more easely with the lighter viscosity oil. The 15w/40 can cause damage to the injectors during cold engine starts due to its thickness. The 10/30 will perform fine under all but the most extreme temp conditions, will not cause a failure. I know I have heard about injector issues on the C-7's, maybe I was just told why, and given a remedy ? Any Comments???
Now I may have a use for the 4 gallons + of 10/30 Amsoil in my garage ?
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Steve, Pat, Hakbar, & Root Motor
2007 National RV Pacifica 36'
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09-16-2007, 04:19 PM
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#2
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Senior Member
Mid Atlantic Campers
Join Date: Feb 2006
Location: McVeytown, PA
Posts: 2,259
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While attending the Hershey RV show this past weekend, I spoke with 2 service reps that were at the CAT booth. Both reps told me that the C-7 loves 10w/30 motor oil, reason, during cold starts the injectors fire off more easely with the lighter viscosity oil. The 15w/40 can cause damage to the injectors during cold engine starts due to its thickness. The 10/30 will perform fine under all but the most extreme temp conditions, will not cause a failure. I know I have heard about injector issues on the C-7's, maybe I was just told why, and given a remedy ? Any Comments???
Now I may have a use for the 4 gallons + of 10/30 Amsoil in my garage ?
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Steve, Pat, Hakbar, & Root Motor
2007 National RV Pacifica 36'
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09-16-2007, 04:44 PM
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#3
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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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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Jestme13:
Now I may have a use for the 4 gallons + of 10/30 Amsoil in my garage ? </div></BLOCKQUOTE>Make sure it has a CG-4 rating. 
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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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09-17-2007, 08:05 AM
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#4
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Senior Member
Join Date: Oct 2006
Posts: 250
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Strange as it may seem, I was told by the parts supervisor @ Savannah, Ga Cat dealer/maint facility that Cat only makes (carries?) 15w40 oil for their engines. Wonder which one is correct??
Freightliner and Cat would us all a great service if they would stop putting out conflicting info..
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06 Itasca Meridian 36G, 350 Cat , Flnr XC-S Chassis
07 Jeep Wrangler Unlimited
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09-17-2007, 03:14 PM
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#5
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Senior Member
Join Date: Dec 2006
Location: New Hampshire
Posts: 128
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I think with the highter temps in the south, there would be no need to stock oil for sub freezing weather.
recommendations from cat web site.
[URL=http://ohe.cat.com/cda/layout?m=72021&x=7]
-4? F to +104? F SAE 10W30 CJ-4
+5? F to +122? F SAE 15W40 CJ-4
Below 0? F, block heater or oil pan heater is
recommended.
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09-17-2007, 09:49 PM
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#6
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Senior Member
Mid Atlantic Campers
Join Date: Feb 2006
Location: McVeytown, PA
Posts: 2,259
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Ah, but Cat does carry a 10/30. But maybe just not in the deep south. Its not a low temp issue guys, its a viscosity issue dealing with the injectors. Lighter is better 
Thanks for the table DonG, except for the southwest, I don't think I will see those high temps, and I know I sure ain't looking to find them either 
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Steve, Pat, Hakbar, & Root Motor
2007 National RV Pacifica 36'
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09-22-2007, 08:21 AM
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#7
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Senior Member
Join Date: Feb 2005
Posts: 486
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CAT RV recommendations are:
-4 to +104 F SAE 10W30
+5 to +122 F SAE 15W40
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Joe & Loretta Fischer
2017 Roadtrek Zion SRT
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02-15-2008, 05:20 PM
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#8
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Member
Join Date: Feb 2005
Location: Livingston
Posts: 63
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Hello
SO if I am a temprate zone of 20 to 95 deg.  I can use either one!!!!!!  Stay where it warm.... 
Scratch
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what ever it takes.....
2006 Itasca Meridian 39K
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