Another oil thread... Is 0w-40 ok in everything?

[2ndAmend]

What kind of oil should I use in the HC??? LOL!!!!!!!!!

Seriously, my Wrangler specs 0w-20, the truck specs 5w-30.

Is there any reason NOT to use 0w-40 in everything? (Cost aside.)

 

[MJS73]

Is there any reason to use it in everything?

 

[2ndAmend]

I like simple.

 

[Unholy707]

When I had my 5.7 replaced they put 0-w20 full synthetic in it. I looked up the part number and they started using that in 5.7s after 2022, but before then it says not compatible. Weird. 0-w20 full synthetic is what will be going on it from now on

 

[Unholy707]

I noticed higher oil pressure with the o-w20 on starts and when driving. When it gets hot it still dips down to 28-30s at idle

 

[Unholy707]

It’s the max full synthetic. Was listed for just the v6 for a while, and now they recommend it for the 5.7

 

[2ndAmend]

I suspect mfr's lean toward low viscosity to reduce friction for a better mpg rating and sacrifice life. The engine only needs to get past warranty.

 

[Unholy707]

I suspect mfr's lean toward low viscosity to reduce friction for a better mpg rating and sacrifice life. The engine only needs to get past warranty.

0-w20 is a full sybtegtic and more expensive than the semi 5w-30

 

[Unholy707]

I had a lifter fail at 50k with 5w-30.

 

[BULL]

Is there any reason...

Yes, there is...

 

[1971demon]

What kind of oil should I use in the HC??? LOL!!!!!!!!!

Seriously, my Wrangler specs 0w-20, the truck specs 5w-30.

Is there any reason NOT to use 0w-40 in everything? (Cost aside.)

I even use it on Ceasar Salad

 

[Jack_Toepfer]

Shouldn't oil viscosity be prescribed based on the climate and operating conditions of the engine?

 

[BULL]

Shouldn't oil viscosity be prescribed based on the climate and operating conditions of the engine?

As well as camshaft/lifter type, and arguably most importantly, oil ring type!

 

[2ndAmend]

Yes, there is...

?????

 

[2ndAmend]

Thanks guys, but so far I don't see any posts suggesting a reason to use a more narrow viscosity range.

 

[Unholy707]

0w20.

 

[2ndAmend]

When I was a kid my father had a Texaco station and would bring home the purple 2-cycle oil and said use it in the 6hp Wheel Horse, the lawn mower, then later the 3.5 B&S on my mini bike. I was horrified, but it wasn't like I was going to spend my 50c/week allowance on better oil!