mvela
Senior Member
- First Name
- Mike
- Joined
- Sep 13, 2018
- Threads
- 17
- Messages
- 1,178
- Reaction score
- 630
- Location
- Orange, Tx
- Vehicle(s)
- 2018 Honda Civic sedan lx 6mt and 2018 Honda Civic hatchback ex auto
Well once heated a 20 weight is recommended. Why would you want to go thicker when 20 is sufficient. To get proper circulation the engineers are basically saying the engine was designed for 20 weight. Putting 30 weight reduces circulation and also causes more friction therefore reducing gas mileage. Yes a 30 weight would work, but so does 20. Just with the 20 you will get the same protection but better mileage. But that’s just my opinion. These newer engines are built with tight tolerances and 0w-20 is plenty protectionHere you go, direct from the 2016+ Honda Civic owners manual. You'll notice it says recommended, which just like fuel recommendations. I think we all know the difference in recommended and required. I've highlighted the pertinent paragraph but I will point out "oil of SUITABLE viscosity for the ambient temperature shown" As you can see, 0-20 covers all temp ranges, just like 0-16 will only thinner. So if you live in a climate that is warmer and doesn't get to -20 degrees you can use a different viscosity for your climate. And if you research further, you will see 5w-30 covers those same temp ranges, looking at the second pic. So what does this tell us, they are thinning the oil for epa purposes but it protects for the same temp ranges.
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