The better engine oil - Dodge Cummins Diesel Forum
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post #1 of 4 (permalink) Old 12-12-2010, 10:06 PM Thread Starter
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The better engine oil

WELL IVE READ TO MY HEAD EXPLODES. The one thing ive figured out is im no closer to picking oil then i was when i started lol. i have an amsoil account so im leaning towards them but not married to the idea. so i guess what im asking is any good experiences versus bad experiences. Some facts would be nice .also whats the differene between 15w40 and 5w40 ?or should the weather determine that ? example using 5w40 during th ewinter and 15w40 during warmer weather ?


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post #2 of 4 (permalink) Old 12-12-2010, 11:10 PM
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Oil recommendations are easy...everybody's got their own and usually have sound reasons for why they choose the oil that they do. Oil has gotten so much better over the years that at times its like agreeing on 99% and debating the 1%. My experiences from a professional standpoint is if I was going to use conventional oil I would go with Shell Rotella. It is a great oil that I have personally seen many big bore (13L +) engines go over 1 million miles on. It is widley used in shops across the country. Personally I run synthetic and use Mobil 1 5W40. I have seen a measurable increase in MPG and no consumption (beyond what is normal). I have run Royal Purple before and had a measurable increase in MPG as well in my Duramax. I ran RP in my 6.7L and saw a decrease from Mobil 1. So I will stick with Mobil 1.
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post #3 of 4 (permalink) Old 12-12-2010, 11:11 PM
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EDIT - I WAS WRITING THIS POST THE SAME TIME AS "TPyle"

you are what seems to be putting wayyy to much thought into this. we run 15w40 in equipment all year round and in the winter it can be as cold as like -10 here unless something extreme comes along. i run 5w40 schaffers in my cummins. necessary? probly not. most 5w40's you'll find are a full synthetic, which is supposed to offer easier starting in cold weather, extended oil changes, quicker warm up times. Basically better for cold. now if you look in your book 15w40 might be in the charts to run down to 10 degrees idk idc. depends where you live. but ive always been told once you go to synthetic you really shouldn't switch back and forth. SYNTHETICS are rated for a wider range of temp too!

this kinda got long on me but really it just comes down to your climate? if you live somewhere dont get really hot or really cold dont waist your time with 5w40, but say you live in Alaska then i would without a doubt run it.

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Last edited by farmin; 12-12-2010 at 11:17 PM.
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post #4 of 4 (permalink) Old 12-12-2010, 11:25 PM
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i run Rotella T6 because of it's supposed ability to handle extreme temperature changes which, for me, is very necessary. haven't had any problems so far...

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