3rd gen Engine/Drivetrain Engine/Drivetrain Modification Discussions for 1999-2003 Models Only (BJ chassis)

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Old May-27th-2005, 02:18 PM
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Seen it, forgot it....

I got questioned on engine break-in period. How long for engine break-in, and how long before running synthetic. I know ive seen a post/thread on all this, but I cant find it.
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Old May-27th-2005, 02:33 PM
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...break-in period for any new vehicle is specified in the owner's manual. In the bad old days (of imprecise tolerances and ordinary materials), break-ins were painstaking and tedious. Now, they amount to driving at a few different speeds and loads, and avoiding some more severe conditions for the first five hundred miles or so. I don't recall exactly what it was for the Mazda (though I did follow it). That was 32,000 miles ago! Consult the manual.
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Old May-27th-2005, 02:54 PM
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Basically the question was, "when can I run synthetic in my new motor?"
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Old May-27th-2005, 03:40 PM
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Originally Posted by QWKSILVR02
Basically the question was, "when can I run synthetic in my new motor?"
I believe it's only like 500 miles..newer engines designs require MUCH lower break in periods
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