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Which 15w-40 mineral based is less likely to harm the cat-converter, and more better on gas savings???

posted by  someone claiming to be 799 on  Sun Mar 27 03:01 CST 2005 [RELATED]

Does anyone know of a good 15w-40 mineral based oil that contains the least additives that destroy and or harm cata-converters? I would like to run some in my 740's for the entire summer (99% highway mileage sustain high speeds). Would a good 10w-30 be able to suit the task? What gas saving percentages would I lose vs using 10w-30? Although delo 400 is very good, i have heard that it can clog up the cat?

Thanks in Advance!






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