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With so little miles/hrs the boutique oils are a waste of money (it can be argued they are, anyhow) I have been using Delvac Extreme 15w40 in my truck and 10w30 in my tractor and small engines for a long time. Generally you can take advantage of Mobil's excellent rebates but they did not offer...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by bullwinkle</div><div class="ubbcode-body">When it comes to winter starts, below 0F, 5W40 synthetic IS BETTER than 10W30 dino-in the old company '04 E-350 6.0 PSD, it was at the dealership in winter to get something minor...

Thank you Garak.

Can you elaborate on the above chart?

I've yet to see a 6.7 of any variation factory filled with 10w30. The book I took the picture from recommends 15w40 in ambient temps above 5*F, and lists the chart as acceptable alternative viscosities for temps below 5*F.

@ George, they are the same engine, and being they are both tier IV compliant they both utilize the CM2350 (ECM). If you were to download the ISB owners manual it would be the exact same one. I'm aware of the cold weather advantages 5w40 carries,. I am specifically interested in why Cummins...

Looking at the engine operators manual of a QSB 6.7 I operate, and they list 10w30 at a lower ambient operating temperature than 5w40. Can anybody elaborate on this? Does 10w30 really have a better CCS than 5w40? Seems backward to me but there has to be some reasoning here. I trust anything that...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: A_Harman</div><div class="ubbcode-body">Are those 10w30 oils on the 3 pages of the approved list CK4 only, or CK4/SN? </div></div> I know in the case of Schaeffers 10w30 and 15w40 CK4, neither one carries the SN...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OPR4H</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: motor_oil_madman</div><div class="ubbcode-body">I guess my main question is do they keep making outdated...

Gonna have to find a different brand to test than Peak if your looking for problems. They are a non 2EH formula and one of the better organic acid technology "universal" type coolants on the market. I've personally ran this through my Cummins engines for hundreds of thousands of miles with not...

Hopefully someone much better qualified than me can answer that but from my experiences no. The Schaeffer rep spec'd out CJ4 to my cousin for his farm equipment, 90% of which is made up of pre emission engines. It is what he recommends as the best value for the extended service interval program...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 2015_PSD</div><div class="ubbcode-body">True or False? Further clarification from the American Petroleum Institute. <span style="font-weight: bold"><span style="color: #3333FF">They tell us that 40-weight diesel engine...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: alarmguy</div><div class="ubbcode-body">You do not mention what weight the oil is. If its a 20/50 it very well maybe current. Amsoil sells a diesel oil rated CI4 or CI4+ in the 20/50 weight. Im curious about the name...

Dnewton, by no means an expert on the matter but I suspect Ford will be able to do no such thing. If they do have evidence of wear unfortunately it's likely from a shortfall in their specific head design rather than an oil formula. I understand how the thought of that can upset owners but of...

I think Schaeffers planned for the obsolescence of CJ4 - my local rep says he can now only get it in drums, no more gallons. All CK4 from here which is just fine with me. I have absolute faith my engines will not seize up on the first oil change <img src="/forums/graemlins/grin.gif" alt="grin"...

Interesting that Cummins has approved extension of oil service intervals by 10k miles with FA4 oils - I wonder what the driver is behind that.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiredTrucker</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Ramblejam</div><div class="ubbcode-body"><div class="ubbcode-block"><div...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Panzerman</div><div class="ubbcode-body">I don't get running super long oil intervals. I get the oil cheap, I change it myself, I get the filters cheap. It just seems sensible to go ahead and change it 3000-5000 miles...

That's one advantage, but certainly not the only reason. Whereas the cords in biasply tires run diagonally, the cords in radial-ply tires run from bead to bead, perpendicular to the tire’s circumference. It's a much stronger design Which gives a more stable tread foundation and a more...

There is a reason why radials are infinitely more popular these days, and why you dont see bias ply on passenger vehicles at all.