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I have seen converters come loose and shake around in side the housing, but it makes a lot of rattling.
As an engine gets older it starts to send more oil through the exhaust due to worn rings and old or worn valve stem seals.
The detergent and anti ware additives will ash up the converter.
Cleaning will have to be more done more frequently until the engine is rebuilt.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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