In the 1980s Ford said their new engines were designed for 1500
miles/qt. to better lubricate the valve guides and that 400/qt. was
"acceptable." They later doubled that when a state attorney general
sued them over this.
At about the same time, VW went further and said 200/qt. was acceptable
so they wouldn't have to fix valve seals that almost failed by 30,000
miles. But the EPA got after them because this also caused excessive
hydrocarbon emissions, so VW issued a recall that included Teflon
seals, a valve adjustment, and elimination of the EGR valve. My Rabbit
ended up having no emission controls except the charcoal canister and a
vacuum advance delay valve.
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