No aluminum bore, no need for syn. oil.
Going back to the early '70's, remember the problems GM had with the Vega aluminum block (without iron sleeves) and cylinder wall failure? The fix was to bore and sleeve the Vega engine (under extended warranty, no less). Finally, after the Vega was dropped, GM production-line sleeved this same 4 cyl. engine that was standard in the Monza. No syn. oil was readily available then. Seems like yesterday.....
