Put 1 gallon of Rotella 10w40 and seems like it cranks too long... - Ford Powerstroke Diesel Forum
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Old 01-07-2012, 08:37 AM
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Put 1 gallon of Rotella 10w40 and seems like it cranks too long...

Well the truck runs and drives fine, this past oil change and fuel filter change i went with 1 gallon of 10w40 and the rest 15w40 rotella because its supposed to be real cold this winter... first time ive done this, i had 3 gallons of this stuff and now only one truck.

So, the truck has brand new batteries and when i first fire the truck up it seems to crank longer than normal before it actually starts.
Say its like 20 outside and the truck isnt plugged in, it cranks for 5 seconds or more, the glow plugs work fine.

I was wondering if it had anything to do with the thinner oil i put into the truck?
Anyone else use 10w40 on their 7.3? Well, i had bought a 6.0 and the oil came with that truck, now the trucks gone i have 3 gallons sitting on the shelf for over a year...

Just wondering if the oil was keeping the injectors from firing off sooner.

Thanks
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Old 01-07-2012, 08:41 AM
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I've never heard of 10w40 Rotella? I've only seen the 5w40,10w30, and 15w40? Anyways, have you checked to see if your glow plug relay is still putting out a good voltage?
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Old 01-07-2012, 08:44 AM
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never heard of any1 using 10w-40...i use Amsoil 5w-40 all year long in my 6.0L !!!
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Old 01-07-2012, 09:06 AM
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Hey thanks for the replys guys.... I screwed the pooch on that one, you guys were right. 10w30

I just went to check the relay. Battery voltage key off. 12.4
Relay output 10.60 volts when its firing up the glow plugs.
Truck fired up right away, its 40 outside.
Battery voltage when alternator is kicked on, 13.1 and slightly raising but i shut the truck off asap.

Maybe im just thinking its cranking longer with the lower viscosity oil.

If it had a few bad glow plugs, is the only way to check them to take them out?
I know its had all 8 put in about 6 years ago. Whats the life expectancy of these ford glow plugs?
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Old 01-07-2012, 02:21 PM
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you want to use a 5w40 oil in the winter its thinner
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Old 01-07-2012, 03:35 PM
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You can ohm the glowplugs with a multi meter without removing them. Search for it on here.
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Old 01-07-2012, 04:05 PM
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Is your relay stock? I use rotella 5w40 year round. I'm in Utah been low 20s high teens not too cold but that oil makes a huge difference in starting for sure. If you have the stock relay go take that out and toss it they are ****. Stancor relay is the way to go for sure.

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Old 01-07-2012, 04:06 PM
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Quote:
Originally Posted by pete37922 View Post
never heard of any1 using 10w-40...i use Amsoil 5w-40 all year long in my 6.0L !!!
Rotella actually has a T5 syn blend...

Shell Rotella T5 10W40 Synthetic Oil, 1 gal. - 8030156 | Tractor Supply Company

like others have said I would check your GPs and GPR...mine was putting out 3 volts. I got a stancor on the way.
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Old 01-09-2012, 02:28 PM
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Quote:
Originally Posted by shiz big red View Post
Is your relay stock? I use rotella 5w40 year round. I'm in Utah been low 20s high teens not too cold but that oil makes a huge difference in starting for sure. If you have the stock relay go take that out and toss it they are ****. Stancor relay is the way to go for sure.

Sent from my ADR6350 using AutoGuide.Com Free
Yes, the truck is 100% stock except for the added hp box. Do you have a part number for the relay, something i can get at NAPA like a ST-85... the relay works, but the voltage was low, HUGE drain from the glow plugs.
But the batteries are 1 month old interstates with like 800 cca each.

The batteries were 3 plus years old and went south, got them replaced for free thru our battery company, i cant complain about that. That was a 200.00 plus christmas bonus the battery company saved my butt
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Old 01-09-2012, 02:37 PM
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Nevermind, i did some research, that stancor relay is just a white rodgers 12 volt relay.
I dont think it will put out more voltage/ cause less draw to the glow plugs.

If i go with one, ill just get it at graingers

Thanks for the tip i appreciate it.

BW
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