the design is 40 yrs old, and the the engine is only driven 40k miles
doesn't consume oil yet and it's not even badly coloured yet
stock oil recommendation is 10w-30 and 10w-40, also 5W-40.
available brands:
Mobil/Shell/Castrol/Liqui Moly/Toyota-brand oil/Gm genuine/GMN longlife/Motul/Red Line/Ford Formula
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