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Old Oct 19, 2024 | 10:10 AM
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What weight oil should I use in a 1999 with 80,000 miles? I have always used Mobil 1 5w-30. Should i use Mobil high mileage oil? What about the 0w-40?
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Old Oct 19, 2024 | 10:16 AM
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The engine was designed for 5W30 - stay with 5W30. I'd use any oil that's SN+ API rated. The API ratings are the only thing that matters. Everything else is marketing BS. Go get the O'Reily's house brand full synthetic, it meets spec

https://www.api.org/products-and-ser...s#tab-gasoline
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Old Oct 19, 2024 | 05:53 PM
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Originally Posted by Lowend
The engine was designed for 5W30 - stay with 5W30. I'd use any oil that's SN+ API rated. The API ratings are the only thing that matters. Everything else is marketing BS. Go get the O'Reily's house brand full synthetic, it meets spec

https://www.api.org/products-and-ser...s#tab-gasoline
God how many times does this come up. I don't understand why you need to change oil weight. please explain that?? i had a car over 350k miles and used the same oil its whole life. I had to stop driving it because the frame cracked in the center of the car. And my car know has 268k with the same oil. Im sorry, this is just over and over and over.................................... .. Dont get. Its probly an internet thing where someone says its better. And you can trust the net 100?.



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Old Oct 19, 2024 | 09:44 PM
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You can go to Mobil's website and get the current recommendation for your car. The 0-40 Supercar is what is recommended for my C5.
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Old Oct 19, 2024 | 10:14 PM
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Originally Posted by helga203
God how many times does this come up. I don't understand why you need to change oil weight. please explain that?? i had a car over 350k miles and used the same oil its whole life. I had to stop driving it because the frame cracked in the center of the car. And my car know has 268k with the same oil. Im sorry, this is just over and over and over.................................... .. Dont get. Its probly an internet thing where someone says its better. And you can trust the net 100?.

For the overwhelming majority, those casually or spiritedly driving an unmodified engine, it is pretty unnecessary. But there are legitimate reasons changing oil weight, they just don't apply to most, and maybe that's what gives people the idea.

Adjusting for oil pressure
Adjusting for more extreme climates
Adjusting for high operating temp protection (track car)
Adjusting for internal engine modifications
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Old Oct 20, 2024 | 11:47 AM
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Originally Posted by dom04abp
For the overwhelming majority, those casually or spiritedly driving an unmodified engine, it is pretty unnecessary. But there are legitimate reasons changing oil weight, they just don't apply to most, and maybe that's what gives people the idea.

Adjusting for oil pressure
Adjusting for more extreme climates
Adjusting for high operating temp protection (track car)
Adjusting for internal engine modifications
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Old Oct 21, 2024 | 07:03 AM
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I am going to stick with the Mobil 1 5w-30.
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Old Oct 21, 2024 | 08:49 AM
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Originally Posted by rwlc5
I am going to stick with the Mobil 1 5w-30.
Good decision.
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Originally Posted by rwlc5
What weight oil should I use in a 1999 with 80,000 miles? I have always used Mobil 1 5w-30. Should i use Mobil high mileage oil? What about the 0w-40?
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