One thing I found with my summers long lubericheck tests is that air cooled engines with out oil filters were the worst as far as quickly degrading oil.
With in a few tanks of fuel the oil in the engines goes black, then 10 to 15 more tanks later the oil starts to turn to kind of a brownish color. Brownish oil tested as "very bad".
Now these were only honda GC160 engines on a pressure washer.
I'm sure they burned less than 5 gallons of gasoline before their oil was trashed.
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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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