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Old 04-18-2020, 09:10 AM   #20 (permalink)
Master EcoModder
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Join Date: Nov 2010
Location: US
Posts: 940

Chief - '06 Pontiac Grand Prix
90 day: 23.19 mpg (US)

SF1 - '12 Ford Fiesta S
90 day: 22.81 mpg (US)
Thanks: 177
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There have been multiple change since the 70s that have effected engine longevity. The more complete combustion of fuel, with the use of EFI and high energy ignitions have significantly reduced the contamination of oil. The fuel its self has had a significant reduction in contaminates.

2012 Fiesta 5W20
2006 GP 5W30

If I had a 70s Escort that had been running 10W40 and had a garage full I would continue using it also.

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