Quote:
Originally Posted by johnnyrod
... it was always said to use any old crap oil for running in and not good oil, then change it for good stuff after the first period (e.g. 600 miles) otherwise you'd always (?) get a smoky engine. Any real truth in that?
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In essence, no. Use the regular oil, 10W-40 semi synth bike oil (JASO-MA). Very basic oils tend not to have the anti-scuff properties (cheaper additive pack), and you still want to protect for that.
In simple terms fully synth isn't "slipperier" or anything, it has better stability and high temperature capability than "traditional" mineral oils, so it can offer better protection under extreme conditions and will offer a longer service life, that's it in a nutshell. By high temps I mean local surface temps between rings and bores, which can be 160C+, not bulk oil temp in the sump (more typically 100-130C).
There's plenty of tech reading on the 'net, but try
this for quite readable and accurate stuff.