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Which engine oil is better?

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Old 02-19-2010, 08:01 AM
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Default Which engine oil is better?
Mobil 1 0w-40 vs Castrol 5w-40?

I have coupons for both and its time for an oil change.
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Old 02-19-2010, 01:30 PM
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i prefer mobile 1. i don't know if you'll be able to get a 100% answer out of this one, i think it's mostly preference
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Old 02-19-2010, 01:55 PM
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id pick the castrol due to the GRADE not the brand
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Old 02-19-2010, 02:36 PM
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Mobil 1>
Did friction tests in engine design class.
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Old 02-19-2010, 02:38 PM
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Castrol. Still working on my 456,000 mile friction test in my Nissan Hardbody. So far, never had the motor apart.
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Old 02-19-2010, 02:53 PM
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Pretty much no oil will fail your engine...as long as you change it.
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Old 02-19-2010, 03:21 PM
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lol so
Mobile 1: 2
Castrol: 2
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Old 02-19-2010, 04:52 PM
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i sware you guys didnt even bother to look at the grade of oil hes picking

this is more than a mobil vs castrol thing
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Old 02-19-2010, 05:32 PM
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The difference between 0-40 and 5-40 is negligible. Both have way too many friction modifiers. I try to stick to 5-30, or 10-40. My Mustang takes 0-20.
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