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Originally Posted by cRiPpLe_rOoStEr
What do you mean by closed-loop? Something like a TBI or the fumigation system used with gaseous fuels? Anyway, even though the old screen-type oil filter had been not so bad at all due to its low cost and long life, now a bypass oil filter is the rule in a good resto-mod.
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Just something with an oxygen sensor. If memory serves, none of the early stock VW systems had one.