5w30 vs 15w 40

[123buster]

call me stupid but i purchased some amsoil 5w 30 for my truck and then realized the owners manual says 15w40 amsoil.com showed the 5w30 as an application for my truck but i do not want to have any problems. so should i use the 5w30 or get the 15w40

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2003 High output CTD, 6 speed, 4x4, QC, short bed white, weather guard tool box , silencer ring mia, 5 inch exhaust, Airdog 150, Smarty, dipricol optix guages (pyro, fuel, boost), body guard front & rear replacements, and loving it.

[nfkfirefighter]

with the preformance you have on your truck i would say only 15w 40 or it would be way to thin... i wont run anything but 15w 40 in mine... just my 0.02 stock to what i have now is only 15w 40

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Tony Peterson - ACDC President

United States Air Force Firefighter! 03 White QCSB 6 Sp. H.O. isspros and a "few" mods from the site sponsors.. there the best! http://www.cumminsforum.com/forum/site-sponsors/ Dead..

[smokedrail]

I am running amsoil 5w-40 in mine. Amsoil is that good that you don't need 15-40

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07 cummins quad cab 4x4 6 speed with go fast mods
96 12v club cab auto that likes to smoke

[123buster]

yea but this 30 w is it still ok it kind of scares me but amsoil had it listed for my truck

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2003 High output CTD, 6 speed, 4x4, QC, short bed white, weather guard tool box , silencer ring mia, 5 inch exhaust, Airdog 150, Smarty, dipricol optix guages (pyro, fuel, boost), body guard front & rear replacements, and loving it.

[123buster]

any more advice, quick?

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2003 High output CTD, 6 speed, 4x4, QC, short bed white, weather guard tool box , silencer ring mia, 5 inch exhaust, Airdog 150, Smarty, dipricol optix guages (pyro, fuel, boost), body guard front & rear replacements, and loving it.

[CAttletrkr]

I ran some thru mine. If you're worried about it, save it for winter.

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'07 3500 Chassis cab, Aisin, no mods...ever...well maybe....hopefully soon

GONE!!! '04.5 3500 SLT QC DRW NV5600 SMARTY, 209K

[Diesel Head]

take it back...

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"I love the smell of burnt diesel in the morning , it smells like victory" USMC

2007 2500 6.7 Quad Cab, 4x4,
6 speed auto, 3.73, Banks Ram Air Intake, Banks Exhaust, 13-18 MPG, AY Flash, New Turbo, we need CNG NOW !!!

[kdhrick]

If I were to use the 5-30 it would be in realllly col weather
Amsoil is good but I would stick with 15-40

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2006 2500 Inferno Red Quad Cab, Bully Dog Tri W/monitor, Amsoil bypass, Amsoil fluids throughout, Line X bed liner, rear wheel well liners, Luverne step sides

[CAttletrkr]

Originally Posted by CAttletrkr

I ran some thru mine. If you're worried about it, save it for winter.

...I ran mine for 16K and the UOA came back saying good to go further. I don't think it's a good idea to do it year 'round, but for the winter months or if you don't tow much I think you'd be safe.

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'07 3500 Chassis cab, Aisin, no mods...ever...well maybe....hopefully soon

GONE!!! '04.5 3500 SLT QC DRW NV5600 SMARTY, 209K