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Old 10-04-2013, 05:57 AM Fanatic

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Synthetic for winter

I change my oil every 5k (15-40 rotella, motor craft filter) and was wondering about rotella t6 for winter. Once last year in Indiana I had a day it was a couple degrees no block heater and after about 4 attempts at cranking it started, but about a gallon of oil poured out of my oil cooler from being so thick. I heard synthetics can make thing leak more due to flow and with the oil cooler and the turbo pedestal leak am I alright? Is it worth the extra $ and could I extend my interval to 10k with t6?

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Old 10-04-2013, 06:35 AM
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It will make a obvious difference in really cold start-ups. And NO, it shouldn't "leak more"... I mean, if the difference in 10W of viscosity is what's keep oil in the motor you've got other problems

Think about it, changing to a synthetic doesn't effect engine oil pressure, it's not "leaking around" the pumps gears because it's thinner, it just seems like it might but really doesn't. It's a fallacy...

As is, the "double the change mileage". Synthetics contain no more of a Lubricity Package than Dino Oil. What they do is to tolerate much larger ranges of "abuse" and don't rely on viscosity as much to do their job. But, Dirty oil, is Dirty oil. Once it's contaminated it needs to be replaced.

That being said, it's possible your 5K change is more often than you actually need (it's good to be safe though) and 10K is not completely unreasonable for the T6 (especially considering that during that time, if you had an "abusive" environment, it would be less effected) but I would want the analysis to be done to know for sure...

Last edited by NoRalPh; 10-04-2013 at 07:43 AM.
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Old 10-04-2013, 07:13 AM
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I know on my 6.0 it made a huge diffrence in cold start up and I didnt have any extra leaks.
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Old 10-04-2013, 02:34 PM
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i have been using delo synthetic and it really helped with cold starts.
dont even need to use the block heater.
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Old 10-04-2013, 03:56 PM
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I run rotella t6 year round runs great never had a problem we had a week last winter the high was 5 degrees all week she fired right up no problem very little smoke. I won't switch my oil from the rotella t6 its great just expensive.

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Old 10-04-2013, 05:08 PM
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Oh yeah it makes a huge difference in cold starting. So much more smooth and no more 'romp'
7.3 Powerstroke 25 degree cold start - lope on startup - YouTube

I really like the Rotella t6, it's cheap (for a synthetic) and makes the truck run quiet and smooth. It doesn't get that cold here but I have never had a hard time starting now that I run synth and have a properly working glow plug system.

I ran oil analysis on mine after 7,500 miles and paid extra for TBN test - it said there was a ton of life left in the oil. That said I still change at or around 5k still running the rotellla, but I would feel fine about running it to 7,500 miles.

And nope, shouldn't leak any more either most of that are old wive's tales. I used to go back and forth between regular and synthetic because I got a smokin deal on oil. There's nothing wrong with that either other than the fact that I like the way the truck runs running synth.

best of luck!

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