[Archived]

Shell Rotella 15/40, 8K miles. Oops, should have been 6K not 8K, CRS at fault.

[Archived]

I don’t use synthetic. I use Mobil Delvac 15w40 and change around 5000 miles. I could go longer, but oil is cheaper than engines any day. Also, I have an EGR engine and the oil gets dirty faster. I also do the fuel filters at each oil change. Also cheap insurance.

[Archived]

What Mark just said, right down to the 5000 mile interval. Our coaches require a lube at 6200 miles (more or less depending on vintage) so since I am under it for that reason, an oil change is not that much additional work.

Having said that, the amount and type of driving you do should guide you in what works for you. I cannot remember the details but at a Detroit Diesel seminar they offered guidance on oil change intervals. While their book recommendations was XXXXX miles, the reality is they want to see oil changed based on gallons of fuel run through the engine. The harder a coach is run, the more fuel is burned per mile, and the lighter the loads on the engine the less fuel with their point being they determined oil life has a direct correlation to the amount of fuel run through the engine. I just don’t know how to find that information.

But like Mark I just err on the side of caution. I am sure I am throwing away perfectly good oil, but my engine is likely benfitting greatly by that.

[Bob]

I run Amsoil and change at 10,000 miles with oil analysis each time. Chassis lube at same time but most of my miles are in a dryer climate.

My oil analysis’ generally shows little wear and good chemicals but has been showing a little thin on viscosity with no contamination. A new BMW I acquired recently requires a viscosity not marketed by Amsoil and I’m using Red Line. My next change on the bus will be using Red Line but I won’t know the results of the Red Line oil analysis for awhile.

[Archived]

Joe,

Have You seen the Amsoil Micro Filter ? It filters the oil down to such minute particles that what comes out of the filter is basically new oil. The filter element has to be changed every so many miles. And You have to add back what oil was lost in the old filter. I seen a Dodge Dually with a Cummins in it that a Amsoil Rep drove around that had 250K Miles on the same oil. After that I done some research on it. And there are some huge industrial machines that they do the same thing with. One Man told of working in a factory for 35 Yrs , and this Machine had the same oil in it. After that I started running it in My Harleys. And You can definately tell a difference. Sounds like a plug for Amsoil doesnt it ? I am not a dealer or associated with one either. I will do some research on Detroits and the Micro filters. I am curious what it would cost initally ? It was originally made for Airplane engines. Should be good for a Detroit ?

Has anyone ever used a system like this on a Prevost ?

Thanks,

Rocky

[Archived]

Go for it. Back when I was a few decades younger everyone that wanted to reduce or eliminate oil changes bought the toilet paper filter, but I guess that has now gone high tech.

I’m one of the conservative folks that believe the change intervals the Detroit Diesel engineers recommend are important for many reasons, so I will stick with what they say (or even more frequently) until they change their recommendations.

If Ken Brewer is reading this I hope he can offer his expertise to the topic.

[paul]

It is great to keep oil clean. *But* you also have to look at the additive package as well. If the additives are used up, the oil is not going to do it’s job. Filtering won’t give you additional additives, only an oil change will do that.

[Don]

Check out this link