Question about Shell Rotella T6 5W-40 - Ford Powerstroke Diesel Forum
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post #1 of 22 Old 02-21-2012, 09:53 AM Thread Starter
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Question about Shell Rotella T6 5W-40

i have been using motorcraft 15w-40 motor oil in my 6.0 but was thinking about switching to the rotella t6. i have read that plenty of people use it but i was wondering if it's ok to use the 5w-40 when ford calls for 15w-40? i talked to a tech and he said he wouldn't do it which makes me a little nervous. so is the 5w-40 ok to use in my 05' 6.0? is the 5w-40 just for colder climates? i live in texas where winter is about over and it gets hot here in the summer so should i still go with the rotella 5w-40? any advice would be appreciated as i need to do an oil change. i am also going to try the AR9100 with this change if that makes any difference. thanks.
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post #2 of 22 Old 02-21-2012, 10:21 AM
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I use T6 and I am happy with it. I switched from 15W-40 and the truck starts better in the cold, warms up faster, and idles smoother. The T6 is a synthetic oil, so it will dissipate heat better and doesn't foul up injectors like dino oils do. For those reasons it will extend the life of your turbo and injectors. I don't know why the Tech would tell you not use 5W-40. In most situations, it will perform exactly like 15W-40. The only area where it will be different is in cold weather, when it will out perform the 15W-40.

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post #3 of 22 Old 02-21-2012, 10:23 AM
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Should not be a problem to run the T6 all year round

2006 F-450 XLT 4x4 Auto 4.30L Alcoa 19.5" 16,000 GVWR
Kelderman 4-Link/4-Bag Rear Suspension, Lariat Seats, '08 Console, '11 Mirrors, CTS, SCT X3
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P-Max w/WPE billet wheel, Spearco IC, 4" Banks Exhaust, Shell T6, Zerex EC-1, Oil bypass filter

48,000 miles
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post #4 of 22 Old 02-21-2012, 10:59 AM
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IF your tech will not run it show him the Owner's manual where is shows the different weight oils and the temp ranges to run them.

I have run T6 in the past even ran a few changes of the newer formula. I would recommend it following the posts above.


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post #5 of 22 Old 02-21-2012, 11:02 AM
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ive heard lots of good about the stuff, i am litterally on my way to go pick some up right now. what would you guys recommend for change intervals?
severe?
normal?
thanx

05' 250 FX4: Studded, Deleted, Airaid, Stage 1 Sticks, 5" MBRP Straight, 7" Black Tip, Livewire w/ Custom Tunes, Foglight Zoodad & Blue Spring Mods, STC Update, Harley Headlights & Grill, Recon Smoked Cab & Tail Lights, 6" Pro-Comp Lift, 37" Trail Grapplers, 17" Helo's, Iron Cross Steps, Matching Bushwackers
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post #6 of 22 Old 02-21-2012, 11:03 AM
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I use it and am happy with it. Starts more easily and idles smoother and a little quieter right off the bat...

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post #7 of 22 Old 02-21-2012, 11:08 AM
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7400 miles w/o a oil by-pass filter kit....NEVER more than 10k if using a by-pass filter. I did PLENTY of research on BOBISTHEOILGUY forum. Made my head hurt but settled with OEM intervals.


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post #8 of 22 Old 02-21-2012, 12:30 PM
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Another happy T6 user here. On my fourth oil change after going from T5, and it's running great.

"Big Duke": 06 F350 King Ranch
long bed, crew cab, dualies
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post #9 of 22 Old 02-21-2012, 12:44 PM
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7500 miles between oil changes. Severe duty 5000 miles between oil changes. I change mine at 5000 miles.
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post #10 of 22 Old 02-21-2012, 01:00 PM
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I've been using T6 for the past 2 years... It's great stuff!

2000 F250 SC/LB Lariat 4x4 PowerStroke
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