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The X16SZ is good package for low fuel consumption in a Vectra. Specific power is not high due to the 'short' 254º camshaft, but that means lower torque peak (2800rpm), which allies well with the Vectras wider ratio gearing. The compression ratio is a relatively high 10.0:1, which helps efficiency.
The main virtue of late '80s/early 90s Opel SOHC engines is they are almost bombproof and easy & cheap to maintain.
BTW, did your Vectra came with onboard computer?
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