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Here's my opinion: Don't use that test. It's not a very reliable test and puts pressure on all the seals in the engine and could cause a seal to blow out.
If there are no other problems with the engine, don't worry about the blowby.
The YouTube engine has virtually no blowby. I've seen 617's puff like steam locomotives yet still run fine.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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