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5w40 syn

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Old 10-12-2005, 10:26 AM
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Default 5w40 syn
is 5w40 castrol syn good for the lt1's? or should i use mobil 1 5w30
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Old 10-12-2005, 11:13 AM
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There is only 3 real companys that "make" oil. I know penzoil is one.......but anyway. I have run all types of oil. I do like Castrol I run that in my LT1 20w50 (Vortech). I run 10w40 in my 2000.
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Old 10-12-2005, 12:37 PM
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Patman, the oil expert around here recommends the 0w-30 german castrol, or the mobil 1 5w-40. The mobil 1 5w-30 is too thin and shows about twice the wear indicators as the mobil 1 5w-40.
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Old 10-12-2005, 01:18 PM
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what he said.
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Old 10-12-2005, 02:09 PM
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so is the 5w-40 castrol syn good as mobil 1 5w-30? or should i just use the mobil1 and call it a day?
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Old 10-12-2005, 06:34 PM
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Originally Posted by TRIPOWER1
so is the 5w-40 castrol syn good as mobil 1 5w-30? or should i just use the mobil1 and call it a day?
The LT1 (just like the LS1) definitely benefits from a slightly thicker oil, so any of the 5w40s out there will be better than Mobil 1 5w30.
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Old 10-12-2005, 08:10 PM
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i was just wondering because i have cases of the 5w-40 castol syn @ work.
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Old 10-12-2005, 08:18 PM
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the castrol 5w-40 i use @ work is not the german blend i think but the oil is gonig into vw's its what they recommend for all their motors.
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