Quote:
Originally Posted by rice_classic
Eloquent, simple, accurate.
In that other thread it will see it mentioned that this is a Direct Injected engine and some DI engines have a tendency to have some fuel get into their oil as a result. I don't know if this DI engine is susceptible to that but hence the need for oil analysis. I think changing at 3k is way overkill though, especially with how good modern oil is now including synthetics.
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EDIT: Okay nevermind couldn't find it, but I'm not sure how much higher temperature say 40 or 50 weight oil can take and still maintain 20 weight oil (at more reasonable temperatures) viscosity, I have a feeling it's not that much. Also, thicker oil naturally picks up more heat as a result of increased friction, though I imagine this is not a big effect (could be wrong). The biggest argument for thicker oils that I've seen on BITOG is that sliding surfaces under high pressure (i.e. cam lobes) don't receive pressurized oil and so thick oils actually do protect them better, but this engine's valvetrain has rollers so it's not as big of a deal or something.
I also doubt the DI fuel dilution thing is true. By design DI is supposed to place more fuel towards the plug and away from the cylinder walls since the fuel has less time to mix and vaporize at low engine speed.