I've been known to drop the synth out of engines, refill with dino, and after the run in period, switch to synth. I had a Honda Blackbird I bought with 3000km on it, and it had been run in the way I do it and motoman suggetst. But I put dino in it for 1000km anyway to complete the runin. Synth is just soooooo damn good it it's rediculous. One article in a magazine several years ago by a GP engine builder, the guy said that after testing rebuilt engines using synth, they found that after the normal run in period (a couple of hours on an engine dyno), the engine was NOT run it much at all. Some of the machining marks they wanted to get red of for racing were still present. So, under VERY carefully controlled conditions, they began to do the run in with dino, then the best synth for racing.
Oh, in case somebody needs to ask : Dino = dinosaur = out of the ground, refined, additive package.
You used to be able to buy 'running in' oil that was a premium base stock oil with no additive package at all to run for the first 500 - 1000km for just that reason - It was considered that the additives made the running in longer.
As an aside, a mechanic freind believes that a gently run modern motorcyle engine could take up to 10,000km to completely run in on synth - he has some very gentle riders for customers, who don't believe you should run over 4000rpm....... Why would they put the red ling at 14,000 if they didn't want you to go there? Huh?
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