Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 11, 2025 ...

Oils, Fluids - Type

July 14, 2019, 02:53:29 pm

As I am new to the diesel world, I was curious as to what weights and brands of oils and hydraulic fluids everyone is using.
I have the cummins 8.3.
Your thoughts ?

Quote Selected

Re: Oils, Fluids - Type

Reply #1 – July 14, 2019, 02:58:10 pm

Most use 15-40 weight oil.

Shell Rotella T and Delo 400 are popular brands and available at Walmart, etc.

Not sure there are any "bad" oils that are diesel rated.

Be sure to use a diesel oil rated CK4  NOT FA4.

As far as hydraulic oil, most of the reservoirs are labeled with what is recommend.  Delo 400 15-40 for most year models.

Quote Selected

Re: Oils, Fluids - Type

Reply #2 – July 15, 2019, 04:09:40 am

Trying to not start the debate but many of us use Amsoil and install an 2nd oil filter that filters to 1 micron,we take oil samples and
can go upwards of 20K miles on a change.

Quote Selected

Re: Oils, Fluids - Type

Reply #3 – July 15, 2019, 08:26:55 am

Yes Amsoil all around.

Quote Selected

Re: Oils, Fluids - Type

Reply #4 – July 15, 2019, 08:46:37 am

15-40 oil in the motor and generator, 15-40 in the hyd tank, transend 295 spec fluid in the transmission, long life OAT red coolant the the radiators, 85-140 synthetic gear oil the rear axle.
Synthetic lubricants are good stuff and $$$, your call.

Quote Selected

Re: Oils, Fluids - Type

Reply #5 – July 15, 2019, 10:55:51 am

Amsoil all around and I am really pleased with the "Torque Drive "Synthetic in Allison, much better than the Transynd I took out.
As John 44 mentions we also have the bypass oil filter.
JohnH

Quote Selected