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Originally Posted by 2016 Versa
I'm not convinced lighter weight oil is better for an engine or MPG. I've got a 2016 Nissan Versa SV 1.6L with CVT. In about 13 months of driving and 10527.8 miles tracked my overall average is 47.082 MPG using old school conventional 10w40. I suspect with use of some of these light weight oils the engine may not be getting lubricated properly and may actually cause more wear and more friction. I'm almost 400 miles into the current tank on the Versa and according to the Ultra Gauge I'm in line for my best ever tank at somewhere around 52 MPG.
I ran 10w40 in my old '88 Ford Escort too, when I retired it a few years ago it had 518K miles and hadn't never been rebuilt.
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My personal experience, when cold, they definitely make a difference. In Vermont, I've seen weeks where you physically could not pour 10w30 out of a bottle, nevermind pump it through tiny oil passages. I can't imagine it's lubricating very well.
There are also Honda engines I'm aware of which have been running 0w20 from day 1, and have over 600,000 miles on them - with aluminum blocks. Honda and Toyota have been running much thinner oils in Japan for decades than you can buy in the US even today.
https://www.eneos.us/blog/going-low-viscocity/
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Nippon Oil & Energy USA, Inc., reports that 0W-16 showed an improvement in fuel efficiency by two percent compared to a 0W-20 when tested in the popular Honda Fit using their chassis dynamometers.
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A Japanese automaker has already used 0W-8 for their factory fills in Japan since 2012 and may move on studying “super low viscosity oil,” which may be lower than 0W-8.
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As for whether it's safe or worth it, I can't speak directly to that. However Honda has been filling their hybrids and L15 motors (including those with turbos I believe) with something that resembles a 0w8 for around 8 years now.