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04-10-2021, 08:20 AM
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#21
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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I use what Cummins recommends. With a 14,000 mile oil change interval and the most durable motor on the market, that oil must be just fine.
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2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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04-10-2021, 11:09 AM
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#22
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Montana Fan
Join Date: Feb 2018
Location: Arlington
Posts: 136
M.O.C. #21176
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I use Amsoil on all of my vehicles.
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2011 Volvo 780 485 HP/1750 TQ 13 Speed 32000 lb ET air ride hitch
2016 Montana 3820FK Legacy package
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04-14-2021, 01:20 PM
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#23
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Montana Master
Join Date: May 2016
Location: Cuyahoga Falls
Posts: 699
M.O.C. #18572
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Motorcraft semi-synthetic.
Free oil changes for ten years from the dealer I purchased the truck.
Yippee
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04-14-2021, 01:35 PM
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#24
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New Member
Join Date: Sep 2019
Location: Tiffin
Posts: 6
M.O.C. #24861
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Shell Rotella T6 The cheapest I've found is Rural King. 2.5 gallon container. Sometimes you can catch a 10% off store sale.
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04-14-2021, 02:45 PM
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#25
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Established Member
Join Date: May 2018
Location: Foley
Posts: 42
M.O.C. #21745
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Truckin Oil
I have always used Rotella T6 5w-40. I change my own oil or buy the oil and have the oil shop do it if I'm in a pinch.
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04-14-2021, 03:59 PM
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#26
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Montana Fan
Join Date: Nov 2011
Location: Albany
Posts: 407
M.O.C. #11972
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Mobil 1 Turbo Diesel synthetic.
__________________
2012 3150RL. G614 tires. Hardwired surge protector. Level-Up Hydraulic leveling.
2013 F-350 Lariat 6.7 PSD SRW SC LB 4X4 OEM hitch, air self-leveling on rear. 57-gallon replacement fuel tank. DieselSite water separator/fuel filter.
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04-14-2021, 04:35 PM
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#27
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Montana Fan
Join Date: Jul 2019
Location: Mesa
Posts: 277
M.O.C. #24588
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Shell Rotella T6 for my 2020 F-350 6.7 diesel changed every 5K miles. I always use Ford's OEM oil filter. I Installed a Fumoto valve PN F106N on the first oil change. Takes the mess out of the initial surge of oil once the drain plug is removed. Dang oil can shoot 18" horizontally when the plug is removed without the Fumoto valve. I also use a screw driver to puncture the bottom of the oil filter then wait a few minutes to let it drain, before trying to unscrew it. Hint, don't try to change the oil on a windy day. When my truck was new, I wanted to install the Fumoto valve before draining the oil so as not to have the massive stream of oil gushing out. The dilemma was how to accomplish it. I connected a portable vacuum cleaner to the fill port on the valve cover, taped the hose in place and turned it on. The suction created on the interior of the engine, prevented the oil from exiting once the drain plug was removed. The Fumoto valve was installed without a loss of oil. DYI oil change allows for a thorough inspection of undercarriage for problems.
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04-14-2021, 07:46 PM
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#28
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Montana Master
Join Date: Sep 2017
Location: Willis
Posts: 896
M.O.C. #20587
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Rotella T6 when I find it cheap at Sam's Wholesale $62/12qt. Often use Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil - good price @ AMZN $55/12qt. Always send sample to Blackstone Labs for analysis.
__________________
2018 Montana 3791RD (SOLD)
2017 Ram 3500 DRW 6.7 Cummins Aisin, B&W RVK3600 (SOLD)
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04-14-2021, 10:04 PM
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#29
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New Member
Join Date: Apr 2021
Location: Frisco
Posts: 2
M.O.C. #28575
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Amsoil Signature Series 5W-40
I've been using Amsoil 5W-40 full synthetic with Amsoil oil filter since my truck was new and it runs better now at 150,000 miles than when it was new. In the past two years or so, Amsoil Signature Series is the only oil certified for use in 3/4 ton and 1 ton trucks that allows you to skip an oil change. I routinely reset my oil change warning when it goes off the first time and then change oil and filter at the next. Depending on how much I have been towing, I'm getting 11,000-15,000 miles between DIY oil changes which makes the $150 price well worth it. I didn't believe the longer oil change period at first, but several oil analyses have confirmed Amsoil's longer life promise.
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2015 Ford F-250 6.7l King Ranch 4x4
2016 Keystone Montana 3440RL 5th Wheel
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04-15-2021, 01:29 PM
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#30
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Montana Master
Join Date: Feb 2008
Location: Hillsboro
Posts: 593
M.O.C. #8238
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motor oil
In a way, I'm kind of surprised nobody has mentioned using Chevron Delo 400, 15-40. I've been using it for many years. Made a believer out of me when I had a 1984 Toyota turbo diesel pickup. Had to take the head off (timing belt failure) and when the shop was checking the bearings (70,000 plus miles) they asked when I had replaced them. I said "never" and they said what oil am I using. I told them and they said keep using it, it's doing a great job, the bearings were like new. I have also used Mobil Delvac 15-40 when the dealer was changing it when the GMC I have was new.
__________________
Terry and Patsy
Vietnam Veteran, US Navy
2017 3810
2015 GMC Sierra 4X4 3500 SRW
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04-18-2021, 12:07 PM
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#31
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Montana Master
Join Date: Feb 2020
Location: USA
Posts: 607
M.O.C. #25842
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Ford filters and Rotella T6 5W-40 every 5,000 miles.
Subscribed to PowerStroke Tech Talk w/ARod
He's a diesel tech at a Detroit Ford dealership. Lots of really good information.
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