LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Will using 10w40 in my high milage LT1 be ok or no?

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Old 11-26-2012, 11:32 PM
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Will using 10w40 in my high milage LT1 be ok or no?

I just recently bought it from its second owner. It has 221,xxx miles, but I was told the motor has less miles on it. Second owner told me the first owner replaced/rebuilt the motor but he didnt know when.

I read the carfax and it says nothing about the motor being replaced or rebuilt, so I am going to assume it has 221,xxx miles.

I am going to do an oil change, and I was wondering would using high mileage 10w40 hurt anything? Or should I just use 10w30?

Because I am not sure the exact mileage on the motor, and if it does really have 221,xxx miles it sure runs strong!
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Old 11-27-2012, 06:20 AM
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Re: Will using 10w40 in my high milage LT1 be ok or no?

Originally Posted by 94FormulaV8
I just recently bought it from its second owner. It has 221,xxx miles, but I was told the motor has less miles on it. Second owner told me the first owner replaced/rebuilt the motor but he didnt know when.

I read the carfax and it says nothing about the motor being replaced or rebuilt, so I am going to assume it has 221,xxx miles.

I am going to do an oil change, and I was wondering would using high mileage 10w40 hurt anything? Or should I just use 10w30?

Because I am not sure the exact mileage on the motor, and if it does really have 221,xxx miles it sure runs strong!
I think the high mileage oils have more detergent to clean out sludge and additives to swell old leaky seals. I don't think either would hurt a young engine. If you don't have low oil pressure issues I probably would stick with the 10W-30 but that's me....
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Old 11-29-2012, 05:54 PM
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Re: Will using 10w40 in my high milage LT1 be ok or no?

All I have ever run in mine is Pennzoil 10w40, it still runs great, uses no oil and has 272000 miles on it.
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Old 11-29-2012, 07:50 PM
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Re: Will using 10w40 in my high milage LT1 be ok or no?

It's OK to run 10-40 in it if you're not in really cold weather.
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