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Old 11-17-2011, 02:57 PM
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7.3 oil question

i currently have been using rotella 15w40 on my 7.3 but at work we have a huge 55 gallon drum of all spec 40w rotella...would it be ok if i used this oil in the summer and stuck with the 15w40 in the winter? only reason im asking is im not really familiar how oil weight works in summer vs winter and thought itd be cool to get some free oil changes courtesy of my job...

Thanks..
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Old 11-17-2011, 06:16 PM
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Where do you live? I wouldnt go with a stright 40 - its really thick when cold.

Hey, also - if you are in a cold area (well even if not) try some 5/40. I run 5/40 year round in the 6L. My 7.3 thanked me greatly when I ran some in it.
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Old 11-17-2011, 07:14 PM
JEL JEL is offline
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Quote:
Originally Posted by Galaxie View Post
Where do you live? I wouldnt go with a stright 40 - its really thick when cold.

Hey, also - if you are in a cold area (well even if not) try some 5/40. I run 5/40 year round in the 6L. My 7.3 thanked me greatly when I ran some in it.


These engines won't like a straight 40 weight oil with our injector system, I definitley wouldn't do it, even in summer. You may be get away with it in a non-heui injected truck like a Cummins during the hot months, but IMO it's still pushing it.
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Old 11-17-2011, 07:25 PM
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15W40 for summer. maybe for winter if it's not too cold or a 10W40 but a lot use 5W40 year round.
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Old 11-17-2011, 07:47 PM
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Dont forget the 40w is when it is warm. So warm is warm. The 10w and 5w are cold starts.

At the end of the day, I think all our PSDs like 5/40 year round. Synthetic!
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Old 11-18-2011, 05:34 AM
SyN SyN is offline
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Laka: Good advice above... MHPO---> Those injectors are very expensive-->Esp to replace all 8 at one time...

3k to 4K $ is not worth a few free oil changes...Your 7.3L needs a very robust HDEO not a straight 40WT...

There are many different Viscosity Oils to choose from 15W-40 5W-40 10W-30 5W-30 0W-40... Take your pick... Just make sure it's HDEO! And use an OCI between 5K-7K miles...Depending on your driving habits...

Once again-This is just my advice nothing more... Do as you wish...
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Old 11-18-2011, 05:57 AM
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5-40 T6 synthetic all year long and your truck will be happy.
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Old 11-18-2011, 06:16 AM
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Quote:
Originally Posted by lakailimited06 View Post
i currently have been using rotella 15w40 on my 7.3 but at work we have a huge 55 gallon drum of all spec 40w rotella...would it be ok if i used this oil in the summer and stuck with the 15w40 in the winter? only reason im asking is im not really familiar how oil weight works in summer vs winter and thought itd be cool to get some free oil changes courtesy of my job...

Thanks..
To totally beat a dead horse...no I would not use a straight weight oil in your truck...your HPOP and injectors will not like it. Free stuff is great but if it is not up to spec then it will end up costing you a lot more in the long run.

I run 15w-40 in the summer and 10w-30 in the winter and it works for me.
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Old 11-18-2011, 06:21 AM
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5-40 or 15-40 Synthetic will do you just fine. I run 15-40 Synthetic year round with no cold start issues, runs like a champ!
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Old 11-18-2011, 06:55 AM
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I ran rottella 15w-40 for 11yrs a had no problems as long as i pluged the block heater in at temps below 30 unfortuneatly i don't have access to 110v at work.I just switched to rottella t6 5w-40 synthetic last week a got it at walmart for $22 per gal. I'm already noticing a difference.The truck cranks faster and lights off quicker and seems to have better throttle responce.I would deffinately recommend synthetic if live in the colder climates.
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