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Old 04-30-2013, 03:39 PM
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Olds 403 oil type

What's a good oil weight/type to run in my oldsmobile 403?

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Old 04-30-2013, 03:44 PM
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Good old 10W30 unless you have low pressure issues, race it or have extremely hot ambient conditions.
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Old 04-30-2013, 04:09 PM
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Originally Posted by 68NovaSS View Post
Good old 10W30 unless you have low pressure issues, race it or have extremely hot ambient conditions.
I agree. 10W30 is a multi-grade oil, not a multi-viscosity oil. The W stands for winter, so that in cold weather, due to additives in the oil, the oil performs like a 10 weight, but is actually a 30 weight oil.
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Old 05-04-2013, 10:07 AM
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Thanks for the info. this next question is just curiosity but if i didn't have to deal with cold weather would running SAE 30 be the same as 10W - 30 ?
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