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Old 05-23-2012, 11:26 PM   #1
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Yeah, anyone who makes claims like that (neighbor) is so full of it.

Oil viscosity is based on temperature, so the only extreme the engine would see would be way below freezing or "racing." Most synthetics in the normal viscosity ranges are more than enough to protect in street driving, esp CA.
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Old 05-24-2012, 06:58 AM   #2
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more viscosity info

To go with ekam's chart, here's SAE J300 specs on viscosity grades. I've also provided the SAE J306 specs (gear oil) if anyone wants it.

Regards,
paul...
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File Type: pdf SAE J300 2008.pdf (243.4 KB, 178 views)
File Type: pdf SAE J306-TransOil.pdf (15.2 KB, 407 views)
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