My 300CD had a power problem going up hills and I noticed the the old boost line to the banjo bolt had broken off. I replaced it with a new line and the car responded better. When the warm weather came, the in line filter turned blacken and I suspected algae/fungi problem in my tank from sitting over the winter. I again had trouble with power up hills. I replaced the in-line and spin on filter and dumped 5 ounces of Startron Diesel Additive and 3 ounces of Biobor. I know that it is a stronger than recommended shock dosage but both products started that there was no problem with overdosing. The next day the car responded better and every day after. 6 days have past and now the car is having more trouble clogging and stuttering. I suspect the biocides are doing it's thing but how long does this process take to eradicate the gremlins? The in-line filter in clear and has not re-blackened as of yet.

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85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)

I am not sure why you mixed the 2?

From what I have read on the Forums the Biobor kills but does not eat up the dead Bodies of the Organism.

The Startron for Diesels is supposed to have an Enzyme that breaks up the Dead Bodies of the Organism in to pieces that will pass through even the Spin-on Filter.

Mixing them might ruin how either of them functions.

So your guess is as good as mine as to how long it is going to take before you do not have to change any more Filters.

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84 300D, 82 Volvo 244Gl Diesel

Give it a few hours to work and give it a go.

In my experience any brand of biocide will kill them and render them small enough to go through your filter. You need to start with new filters though.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Biobor in my experience did not "break up the Dead Bodies of the Organism into pieces that will pass through even the Spin-on Filter," it did apparently kill off the growth though clogging the in-tank mesh strainer by coating it with a slimy black film resulting in sputtering and stalling out if the car was driven when tank reached reserve level.

No experience with Startron. Mixing the two appears ill advised.

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'83 SD, 2x '85 SD
You are entitled to your own opinions, you are not entitled to your own facts.