How many hrs are you talking about? I've always gone by hrs

 

colt I have no idea since I use miles! Last time I changed oil, it was at 45k. Using an avg overall speed of 50mph, I guess that comes out to around 900 hours? Add your idling in, probably 1000 or so??

That sounds about right to me.

 

Just being a "wanna-be" engineer myself I cannot dispute anyone on their personal opinions regarding by-pass.......HOWEVER I do reserve the right to have my own opinion.......I like by-pass!

And it is nothing new....does anyone remember the old "luber finer" filters like on the old macks? It was not a spin-on...it was a giant tank with a cartridge filter inside....it filtered AND added significant oil capacity as well. When I was a pup selling big truck parts we had a spin-on replacement package for those....you installed an adaptor that took a more "modern" spin-on by-pass filter you still had to keep that big old resevoir can (sans the filter element) to keep that added oil in....I realise that was for cooling and oil capacity, but still......by-pass was important in those days, then went out of vogue for a while, but I am happy to see it is coming back...at least with some manufacturers.

 

traveler Your opinion or desire to have a bypass filter is respected.
What I was saying was<u>for my application</u>, adding a bypass filter would not benifit me as indicated by the results of oil analysis.

If you have a Detroit engine, you already have a bypass filter. (at least alll the ones I've seen have two oilfilters, a full flow and a bypass)

I served aboard one ship that had heated filters of about 400gl size filled with canisters of "rare earth" to nuetralize the acids in the oil!

 

I understand perfectly...and DD was wise to include a by-pass filter in OE design. Your practise of using oil analysis is likewise laudable my point is simply that I like the aftermarket add-on systems out there and they do deserve consideration. It is well worth it for me just for the added piece of mind to have the add-on there as well.

As for naval engineering, I doubt that a filtration system of that magnitude would be practical for a class 8 truck...now if we can put our minds to downsizing an atomic power plant to a class 8...I might be interested!!! Imagine not having to fuel up for years on end! Too bad the admiral (Rickover) never put his mind to it. Perhaps NR might be persuaded to try it now?

 

I have a DD S60 and both of the oil filters are the same part number. Even when I ask the parts man to give me filters using my VIN# to get the part numbers. I use Fleetguard filters. One of the previous posts said that one of the filters on a DD is a by pass filter. Now I am curious!

I have put a FS2500 by pass filter on my truck. Right now I am changing the by pass filter every 10,000 miles and changing the full flow filters and oil at 30,000

 

Ah thank you navistar man....that FS2500 is the one I think I heard of. Most blokes that have them swear by them.

As for your S60...I have never owned one nor researched it too heavily but odds are if both pn's are them same then it does not have by-pass. The by-pass is generally a finer filter than a full-flow.

 

I took a gander at my Detroit 60 series shop manuals.

It seems that DD 60 series had 3 oil filters up until 93, 2 full flow and one bypass. After that they dropped the bypass (?) and the 2 full flow remain.

So I was wrong, sorta!

Seems strange they'd do away with the bypass filter.....

 

WHAT ???

Maintenance is the CHEAPEST repair you will ever do !
IF you want to extend your oil changes by oil Analise's ... then be very carefully , you can do that.
It might cost you more but if your oil changes are with-in you time frame and duty cycle ....... why mess with it ? You are doing what`s best for your engine AND piece of mind .