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The older auto Subies had a problem with an 'O' ring going brittle or hard. This caused the unit to not engage any gears straight away or at all. Apart from having two heads and two of everything associated with the valves, run by a super-long timing belt they are reliable. https://www.google.com/search?q=chan...-e4-EP_d2wwAY2
And head gasket delamination is also a common issue.
Last edited by mudnut; 28th June 2020 at 11:06 PM.