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As long as you never start it below 50 or 60 degrees imperial the multi viscosity oils don't give you any benefit.
That "old oil" you have is likely SJ rated and is packed with additives compared to modern SN rated oil and is perfect for engines that don't have roller everything internals.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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