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15W-40 and cold temps.

D

Dave Wave

Member
I have 15w-40 diesel engine oil in my freshly overhauled NAA.

I have had it parked all winter and now that it warming up would like to put it back to work.

How warm does it have to get until the 15-40 is thin enough to work properly at startup?


Thanks,


-Dave
 
If she starts on her on accord, and the Oil Pressure stays in the green arc., then everything was according to Hoyl.

Why diesel Oil?

What is the advantage over just simply oil?

John,PA
 
(quoted from post at 20:26:54 02/21/12) I have 15w-40 diesel engine oil in my freshly overhauled NAA.

I have had it parked all winter and now that it warming up would like to put it back to work.

How warm does it have to get until the 15-40 is thin enough to work properly at startup?


Thanks,


-Dave
Click to expand...

Ford's original recommendations was 10W with temps +10F to -10F, 20W between +10F and +32F. Your 15W-40 is a 15W oil and somewhere in between. Unless you are in the single digits it's not even close to being a concern although much below freezing the 6V engine may be slow to crank.

TOH
 
John, they also make 'normal' 15-40. Rotella by Shell, I use it in my 1953 '60 JD and it helps the oil pressure gauge a bit ( like I'm only concerned about the gauge) As far as I know the 'mains' have never been touched - I have owned and worked this thing for 41 yrs. (ya, I resleeved, new rings and rod bearings-that's all - not really, but I have NEVER touched the main bearings). b
 
I have regular 15W-40 oil in my NAA and start it up when it is 10-15 degrees above zero. I do keep it parked inside under cover with no heat in my pole barn. It usually fires up about the second or third try. Never had a problem with cold temps for starting purposes.
 
I didn't mean to get in "dutch" with the diesel boys.


The issue waas with a N. Why put diesel oil in a gas engine?

Thought I might learn someth'N new. that's all.

I used to set beside those Caterpillar Diesels along the interstates when I was going back and forth to Pensacla Fla, while I was rest'N in my Ford Van. Most respect to those fellas, (and gals) that brave those interstates.

JOhn,PA
 
Cute - the Dutch connection to Shell Oil - good on ya. Still, the 15-40 is a good alternative to straight 30wt or equivilant. HPH -- b
 
In the early '70s we all used 30w chevron oil in our cummins motors. Then came the 425hp 1693Cat motor. It was the hotest thing you could buy then. We used the chevron oil for the first 6 months. It used a gal. every thousand miles. Finally we tried something called Rotella T by Shell. That changed the oil consumtion to 1 gal. per oil change. That was every other round to California. About 12000 miles. Its the only oil I use in everything except my lawn mower.
 
I never had anything in writing but the Cat dealer told me the (T) in Rotella T stands for turbo-charger. The oil was supposed to handle the high heat in the turbo bearings.
 
Dave,

If it is a new motor, I would crank it, let run at a medium idle for 10-15 minutes to get it warmed up and then go on about my business. I won't speak to 15w-40 in cold weather because I live in Texas. I do use the JD version Plus 50 II in my 8ns and I have loved the pressure and quality in it. I know I pay some for JD but I have a fondness for their quality. It is supposedly made by Shell and has some additives that regular 15w-40 does not have. It treats me right.
 
I put Rotella 15/40 in my F150 pickup in Dec 2010.First thing I noticed was a noisy startup and erattic oil pressure.This happens with high milage engines when the pump loses it prime.Later on I found that 15/40 had a cold pour point the same as 30 oil.I only use the truck 1 or 2 times a month in winter.Every cold start up had oil pressure all over the gauge.In mid dec 2011 changed the oil and filter using 10/30.Started the engine the next day, got instant oil pressure and no noise.Cold oil has to be pulled thru a screen on starting.Truck has 195,000 miles. uses a quart of oil between yearly changes.I have decided to stay away from 15/40 oil in high milage engines.I plan to put samples of 15/40 and 10/30 oil out side while we have near zero weather.You might do the same,an ounce or two in a small jar may change your mind on using 15/40 oil.
 
(quoted from post at 06:59:15 02/22/12) I put Rotella 15/40 in my F150 pickup in Dec 2010.First thing I noticed was a noisy startup and erattic oil pressure.This happens with high milage engines when the pump loses it prime.Later on I found that 15/40 had a cold pour point the same as 30 oil.I only use the truck 1 or 2 times a month in winter.Every cold start up had oil pressure all over the gauge.In mid dec 2011 changed the oil and filter using 10/30.Started the engine the next day, got instant oil pressure and no noise.Cold oil has to be pulled thru a screen on starting.Truck has 195,000 miles. uses a quart of oil between yearly changes.I have decided to stay away from 15/40 oil in high milage engines.I plan to put samples of 15/40 and 10/30 oil out side while we have near zero weather.You might do the same,an ounce or two in a small jar may change your mind on using 15/40 oil.
Click to expand...

It's seldom I agree with Coupe but here I do - SAE 10W30 or SAE 10W40 are much better choices if temps are below freezing. The SAE 15W40 viscosity curve is pretty much the same as the SAE 30 curve all the way down to single digits. You aren't getting much benefit from the 15W part of the SAE 15W40 formulation.

TOH
 
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