Install a pressure gauge between the lift pump and secondaryfilter so you can monitor the condition of the filter and change it before it clogs to a no start condition.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

No way to completely avoid condensation happening in the tank....but keeping it ' fuller' on average as compared to ' emptier' would reduce it...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

This is the most direct and correct answer, and the only one to address the difference between a bio agent and an additive like Startron. Biobor, biokleen etc kill the little nasties but do not dissolve them in the fuel, so you can expect to have to replace fuel filters pretty regularly after adding it, depending on the severity. Startron actually dissolves the buggers into the fuel and allows it to be burned off and passed through the filters, but can make the fuel appear darker than usual if it's a bad infection. There is a distinct difference between these two types of products and the answer to the op's question almost entirely rests on this variable.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

But I thought if I ran a tank or two with startron I would have to carry extra filters because it will cause them to become clogged.