Service Intervals?

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Mar 9, 2023 | 09:43 PM

#16

TCNashville

Laughing Gas

Joined: Mar 2018

Posts: 1,244

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From: South Central Indiana

I'd be more worried about aging fuel than oil.

Mar 19, 2023 | 08:56 PM

#17

Tormarmer

1st Gear

Joined: Feb 2020

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On our 2019 F350 Crew Cab 4x4 short box 6.7 we have 14,000 miles. Bought for long trip RV’ing but with Covid that did not happen. The truck is in a temperature controlled garage, and almost all use is highway travel into town on paved roads, about 40 minutes each way. I’ve done 3 oil changes, based on maintenance minder prompts yearly. I use Rotella T6 and Ford oil filter. The last oil change was after 3,500 miles. I took a sample for analysis which indicated that oil would be good for at least another year and 5,000+ miles. Since then, in 12 months, the truck has added 2,400 miles and the oil change prompt is on.
I’m thinking I might just change the oil filter and leave the existing oil in place.
What do you think?

Mar 19, 2023 | 09:10 PM

#18

Rwhjr

Cargo Master

Joined: Mar 2021

Posts: 2,044

Likes: 1,336

Quote:

Originally Posted by Tormarmer

if you’re doing it yourself and you’re going to be under there to change the filter I would just do the whole oil change at that point.

Mar 20, 2023 | 01:19 AM

#19

mattymax

Fleet Mechanic

Joined: Mar 2006

Posts: 1,519

Likes: 134

Quote:

Originally Posted by Rwhjr

if you’re doing it yourself and you’re going to be under there to change the filter I would just do the whole oil change at that point.

I agree. I never understood people changing just the filter after so many miles. You’re under there, do the oil too

Mar 20, 2023 | 09:39 AM

#20

HRTKD

Hotshot

Joined: Oct 2015

Posts: 19,711

Likes: 12,853

From: Wyoming

All my vehicles get the oil changed on an annual basis unless they exceed the mileage threshold before the 12 month boundary.

With regard to shelf life of oil, AutoZone has an article about this. It's short on scientific facts and they are in the business of selling oil, so take it with a grain of salt.

https://www.autozone.com/diy/motor-o...tor-oil-expire

Valvoline says their oils have no documented expiration date.

https://www.valvolineglobal.com/en/m...od%20of%20time.

Mar 20, 2023 | 02:14 PM

#21

1olddogtwo

Cargo Master

Joined: Apr 2018

Posts: 2,413

Likes: 1,124

Oil becomes very acidic, old oil eating away at seal and bearing material..... Something to think about
I would also start it frequently/monthly to help keep the condensation out of the oil.
With biofuel, almost everywhere now. Be sure and run a algaecide in the diesel fuel.

Mar 20, 2023 | 03:53 PM

#22

morehouse7

Fleet Mechanic

Joined: Mar 2021

Posts: 1,455

Likes: 607

Quote:

Originally Posted by 1olddogtwo

Let it run for awhile to have time to heat up and rid any moisture in the oil and fuel. We had a 2MW DG let go because of years of short readiness starts and zero to little run time. Moisture caused corrosion, finally caused scoring, which ended up hanging a cylinder and the connecting rod tore off. An extreme example but you get the idea.

Mar 20, 2023 | 04:00 PM

#23

HRTKD

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Joined: Oct 2015

Posts: 19,711

Likes: 12,853

From: Wyoming

Quote:

Originally Posted by morehouse7

My Onan/Cummins genset manual says to run it once a month under load. This is the on-board generator in my RV. I run it as the specs say. It may have more monthly maintenance hours on it that actual use. I do change the oil once a year, even though it never hits the number of threshold hours for an oil change.