Bio,
He has blowby. I guess he has caught the problem early. No.2 is on the way out. Have you found a Merc yet that has run serious miles (200k+) continuous on junk fuel with out problems?
20 years ago I was offered a small Bio plant, not some back yard junk. It used canola or sun flower seed as a feed, it had a high pressure & temp. catalytic reactor to remove the varnish. I know a guy who bought one. After 2 years of trouble he gave up. His problems were identical with what we see on here time & time again. I use around 20,000 US gal a year of diesel, with all the best brains I can get my hands on, I, like many other larger users cant get it to work well, what hope have regular mom & dads.
You only have 160,000 miles to go on your current BIO Merc before I will see you as having some credible experience with successful running. I guess you wont keep it that long!!

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving