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I agree the PSD is fine w/B100. I have been having issues w/B100 in my SVO-converted truck though. The problem is while I'm burnin' VO, the B100 is just sitting in the filter bowl on top of HOT engine (ie, towing 5ver thru Rockies) for hours and hours at a time. I started plugging diesel filters (did this a couple times when first running bio - like everyone else) and finding polymerized biodiesel in the filter housing!!! No, there is no way for VO to get in my diesel system - it was from the bio-d.

'Commercial' bio-d should have some 'fuel stabilizers' in it to mitigate this natural breakdown of the VO part of it. But, allegedly none of the B-99 available 'at the pump' still meets the stability part of the ASTM standard, indicating they still don't have it down yet.

On the same subject, Bosch has issued reports recommending no more than B-5 in any of their IP's. They have found evidence of polymerized bio-d in many of the IP's that failed after running higher concentrations of bio-d. That said, obviously MANY folks have had great success running B100 in IP-equipped engines. But, if you're a vendor for auto manufacturers and ya have to warranty your parts - you just recommend what you KNOW is less likely to cause problems.

Like the others said, gelling is directly related to feedstock. We try to segregate our 'lightest' VO for bio-d. We look for VO that is still liquid well below freezing and save that for B100... I use the coke bottle/water bottle trick for every batch of 'winter' B100. If the little bottle gells, I know I need to add some diesel.

BTW, its good to see a post from girlmark! Hows that cheby working for ya?