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4.3 Liter or about 4.6 quarts. I'd love to have my oil AT the full mark, on the dot, but it creeps up the stick each week until it's well above it. It begins each oil change right on the top mark. (hence my 'plan' to go from half down up towards the top mark instead).

So in essence, we are to take that upper most mark on the dipstick without concern? In this case it seems to represent one cup of oil/fluid. I tend to worry less if it were low by that much, though neither seems dangerous.

I know it's been discussed before, but I can't find my specific issue here, so... Is there anything profoundly wrong with adding a touch of, say Royal Purple 5W-30 to an engine that's on a load of 0W-20 from a different brand? i.e. Do different oils interfere with each other or perhaps...

I'm changing my oil early (1500 mile oci) in my wife's Yaris, which has added 6mm to the top of the dip stick marker since the last oil change, from fuel dilution. I'm asking the garage to leave a half quart out of this next oil change, so the level isn't running high all winter. Better slightly...

This rings true to me. Thanks, and 5W-30 is coming in next :)

Do you think the 0W-20 is lacking protection? Is it just for mpg vs longevity?

I do rev it out occasionally, and use Sport Mode out in the country to boost the action. I'm not sure if helps the dilution, or the valves stay clean, or what- but it makes the Yaris more fun :-)

That's why I'm here on this website about oil. I might have thought gasoline in oil would decrease lubrication quality and thus age the engine sooner. Also I've wondered if the oil level growing up over the full mark would violate the spirit of 'Do not overfill' your oil as seen in the car's...

Our Family owns two Skyactiv G engines in the form of recent models of the 1.5 Liter Mazda engines found in the 2019 and 2020 Toyota Yaris compacts (formerly Yaris iA/Mazda2). They take the Toyota 0W-20, which I schedule for 5000 mile or 6 month intervals. [ Toyota is more encouraging toward...