oil weights?

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11-12-2005, 11:19 AM

j9fd3s

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Join Date: May 2002

Location: California

Posts: 22,465

ok for the rx8 mazda recommends a lighter oil than previously (5w-20 i think), its probably for fuel economy, but did they have to make any other changes to make it work? ive had no trouble running any of my cars on 5-20, but will i?

11-12-2005, 04:29 PM

rfreeman27

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Location: fredneck MD

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I run 50weight

yup.

11-12-2005, 05:41 PM

rotarygod

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Location: Houston

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I run 5W20 in a streetported '84 13B. People say it can't be done but I've had no problems whatsoever.

11-12-2005, 05:58 PM

heretic

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Join Date: Jun 2004

Posts: 524

Quote:

Originally Posted by rotarygod' post='777862' date='Nov 12 2005, 03:41 PM

I run 5W20 in a streetported '84 13B. People say it can't be done but I've had no problems whatsoever.

As long as it has oil pressure at idle, it will be fine. Anything thicker just wastes power to drive the pump, and dumps more oil out of the regulator instead of flowing it to the bearings. And rotors.