I was wondering if running bio diesel in the new LMM's would reduce the frequency of DPF regen's, since bio diesel burns cleaner? And what if you ran B80 or even B100? Atleast it'd sure be some clean exhaust in these new trucks.

Maybe slightly, but really this doesn't have much to do with it from my understanding. The DPF is getting clogged primarily from the ash in your oil. The best way to keep from having to do a "stationary regen" as you are most likely refering to is to work the truck hard to keep exhaust temperatures up so that the DPF is constantly burning off the trapped particulate so that you shouldn't have to pull over and do a stationary regen.

Maybe slightly, but really this doesn't have much to do with it from my understanding. The DPF is getting clogged primarily from the ash in your oil. The best way to keep from having to do a "stationary regen" as you are most likely refering to is to work the truck hard to keep exhaust temperatures up so that the DPF is constantly burning off the trapped particulate so that you shouldn't have to pull over and do a stationary regen.

Thanks I didn't know that. Is there really that much motor oil that gets ingested by the engine, or is it just that it doesn't take much? And that being the case are there low-ash engine oils?

DPFs trap PM (particulates) from the exhaust, so fuel type definitely changes the rate at which the filter clogs up. Biodiesel emits up to 50% less PM than LSD (about 30% less than ULSD I think, but don't quote me), so the quantity of trapped particulates that need to be burned off is significantly reduced.

I am not familiar as to how the LMM regenerates the DPF, presumably with periodic elevated exhaust temps. Use of biodiesel should in theory reduce the amount of accumulated PM that must be burned off, allowing more time between regeneration cycles, shorter cycles, or a higher regeneration efficiency as there is less to burn off.

EDIT: The figures I quote for "biodiesel" are for B100. Take a ratio of that for lower blends.

and i saw today that the LMM is B5 biodiesel compatible through dealerworld

Only B5 compatible? I figured it would be higher!!

Currently there are no regulations on the production of biodiesel, you will be hard pressed to find a company that will let you run an unregulated product through their engines. However, the market wants biodiesel compatibility, and thus the 5% ratings.

Edit: These new oils are hitting the market as we speak, to answer your question under the designation CJ-4 I think. When I say the particulate filter is "clogging" in my original post, I meant that this is what is left after regeneration that will eventually cause you to have to clean the filter out manually(this should take a long time to accumulate this ash in the filter, think on the scale of a hundred thousand miles, due to normal engine blowby). Like I said, it may help running biodiesel, but without it regenerating itself passively(at all) it wouldn't take very much time to clog a filter. I read the original post fast and didn't answer very well. Sleeping Giant is correct in his statement that using biodiesel will reduce the time between regenerations.

There are new low ash oils for the 07+ engines