5w20....or.....5w30
06-28-2019, 10:33 PM
#11
Senior Member
5w-30 is also spec’d for the NA engines for severe service conditions, so there’s that.
I would have to find the link, but there’s a thread from a Mustang forum with posts from a guy who was one of the engineers on the modular engines. He said he wouldn’t recommend 5w-20 in ANY modular engine.
I would have to find the link, but there’s a thread from a Mustang forum with posts from a guy who was one of the engineers on the modular engines. He said he wouldn’t recommend 5w-20 in ANY modular engine.
Last edited by 68injunhed; 06-28-2019 at 10:36 PM.
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szym (06-28-2019)
06-28-2019, 10:34 PM
#12
Your Jeep is NOT a Ford so get that crap out of your head. It's like comparing apples to basketballs.
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06-28-2019, 10:34 PM
#13
In the past 20+ years of my career I have found using the wrong weight oil can cause issues such as knocking, tapping. We had a couple hard core old school gomers come in and demand the weight oil they wanted for the change so we obliged them.
Every one of them came back less than a week later complaining of engine noise and that we messed up their engines. So we walked them back to the service bay and let them watch us drain and refill their engines with the proper weight oil and all but one of them came back to thank us for showing them that the engineers that designed the engine knew what they were doing.
Not sure on the last one, he probably had his *** on his shoulders that he was dead wrong.(he demanded 20/50 because it was summer) The manual called for 5w20.
Your engine, you make the call but from my professional opinion if you use the wrong weight oil regardless of miles, you're asking for trouble. I've only built a handful of engines over the span of my 40 year career, 11 as a Ford line tech.
The tight tolerances of today's engines are just that, you try to push too thick oil thru them and they starve.
You can spin your response any way you like but my answer remains the same. Use what your manual states.
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Every one of them came back less than a week later complaining of engine noise and that we messed up their engines. So we walked them back to the service bay and let them watch us drain and refill their engines with the proper weight oil and all but one of them came back to thank us for showing them that the engineers that designed the engine knew what they were doing.
Not sure on the last one, he probably had his *** on his shoulders that he was dead wrong.(he demanded 20/50 because it was summer) The manual called for 5w20.
Your engine, you make the call but from my professional opinion if you use the wrong weight oil regardless of miles, you're asking for trouble. I've only built a handful of engines over the span of my 40 year career, 11 as a Ford line tech.
The tight tolerances of today's engines are just that, you try to push too thick oil thru them and they starve.
You can spin your response any way you like but my answer remains the same. Use what your manual states.
.
06-28-2019, 10:40 PM
#14
5w-30 is also spec’d for the NA engines for severe service conditions, so there’s that.
I would have to find the link, but there’s a thread from a Mustang forum with posts from a guy who was one of the engineers on the modular engines. He said he wouldn’t recommend 5w-20 in ANY modular engine.
I would have to find the link, but there’s a thread from a Mustang forum with posts from a guy who was one of the engineers on the modular engines. He said he wouldn’t recommend 5w-20 in ANY modular engine.
Thank you
06-28-2019, 10:52 PM
#16
No way I'm doing that on an ecoboost.
Not using the 'blend' oil either. Full syn not more than 5k and I'm changing out the factory fill probably at like 500
And here we go
06-28-2019, 10:56 PM
#17
Senior Member
I used 0w-30 in my 2016 5.0 for 30 000 miles without any issues.
06-28-2019, 11:02 PM
#18
The oil catch pan had the sun behind it as the oil spewed out.... it looked like the oil had glitter in the relatively clean oil against the bright sun.
Ever since I've done the same thing 500...1000 miles it gets an oil change.
Even if the filter may catch it...I feel better about it....oil is cheap
06-28-2019, 11:08 PM
#19
Senior Member
06-28-2019, 11:11 PM
#20
Senior Member
Your Jeep is NOT a Ford so get that crap out of your head. It's like comparing apples to basketballs.