Nearly 40mpg on a 50 weight.

[circuitsmith]

On another forum I was banned for a week for getting snarky with a couple people who felt that a dealership did an actionable travesty by putting 5w-30 in an engine that called for 0w-20, and also that CAFE rules on oil recommendation are a myth.

https://www.hyundai-forums.com/threads/incorrect-oil.686209/

 

[ZeeOSix]

On another forum I was banned for a week for getting snarky with a couple people who felt that a dealership did an actionable travesty by putting 5w-30 in an engine that called for 0w-20, and also that CAFE rules on oil recommendation are a myth.

CAFE has brainwashed them well.

 

[2013ecof150]

I noticed absolutely no fuel economy drop On my F150 going from 75w85 to 75w140 in my rears, and 5w20 to 5w50 in my engine.

 

[Greasymechtech]

You get banned when you go against the agenda. When I copy and past pictures from the owners manual, the factory service manual, or TSB's, that show that the thicker oil is acceptable and an option, I get dealt bans from the ignorant moderators too. You can't help all the sheep, especially the dumb ones that think that they are smart. New members should not ask the question if they're not going to like the answer. So many are just bots looking out to see what side you're on. And, some members are worse than the bots. Too many 'in crowd' cliques in forums that jump all over when someone is challenged, even when the 'in crowd' is pathetically clueless and wrong, or have no real world experience. I purposely bring it out in many every now and then. The gang police is watching you.

5w50... ~5 hths... now I'll have to step up to even thicker options. I thought I was a rebel using 5w40 in place of 0w20 or 5w20.

 

[ZeeOSix]

Look at pages 12 and 13, and you will see not much difference in the engine friction until the RPM starts getting above ~2000, and most cars are doing 2000 PRM or less (in over-drive) while cruising at normal highway speeds.

http://www.sveacon.se/lectures/fe_bizol.pdf

 

[ssaaff]

Another proud 20w50 user .
If coolant temps get to 104c on 47c day ,you can imagine the oil temperature .
Btw the coolant temps are pegged to 90c in winter no matter how hard I drive.

 

[HiPowerShooter]

I can get 30+ MPG in my 1973 MGB running on 20w-50 on the highway when running around 62MPH running the original dual carb setup.

 

[JHZR2]

Who’d have thought that a cubic relationship of speed to power, and not driving foolishly and waste fully will yield higher MPGs??!?

 

[Accent Abuser]

What is the point of the heavy oil? Prevent burning?

Viscosity protects an engine. Small differences in wear will make a big difference once I'm over 200,000 and even 300,000, I love this car and if I have my way about it will drive it a million miles.

 

[Accent Abuser]

You get banned when you go against the agenda. When I copy and past pictures from the owners manual, the factory service manual, or TSB's, that show that the thicker oil is acceptable and an option, I get dealt bans from the ignorant moderators too. You can't help all the sheep, especially the dumb ones that think that they are smart. New members should not ask the question if they're not going to like the answer. So many are just bots looking out to see what side you're on. And, some members are worse than the bots. Too many 'in crowd' cliques in forums that jump all over when someone is challenged, even when the 'in crowd' is pathetically clueless and wrong, or have no real world experience. I purposely bring it out in many every now and then. The gang police is watching you.

5w50... ~5 hths... now I'll have to step up to even thicker options. I thought I was a rebel using 5w40 in place of 0w20 or 5w20.

Most people don't understand how oil works. You will be crucified on any of the car subreddits if you suggest something as simple as using 5w40 HDEO instead of 15w40 HDEO, even though they're exactly the same above freezing temperatures.

Nobody bats an eye at pouring Lucas oil stabilizer in a worn engine despite the fact it's kv100 is something like 100cst but suggesting using a thicker oil instead will start WWIII.

 

[FordMan59]

I'm experimenting with 10w-40 in my 5w-20 and 5w-30/10w-30 spec vehicles. so far, so good and I like it. We'll see how it goes in our mild Winter's.

10w40 will be fine in SC winters. I used it for years while living in the Charlotte, NC area. I am now in southwestern KY where it gets much colder but I'm still using 10w40.

 

[FCD]

I've run 5W-50 in my daily driver, no difference vs 5W-40 or 10W-40 in terms of fuel economy, none.