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-   -   My 8 stopped burning oil? (https://www.rx8club.com/rx-8-discussion-3/my-8-stopped-burning-oil-208641/)

Chad D. 12-14-2010 06:58 PM

+1
This is a very good idea.

PeteInLongBeach 12-15-2010 03:14 AM

Are you checking the oil exactly the same way each time (level ground, fully warm engine, 5 minutes after shutting off, etc.)?

Delmeister 12-15-2010 11:54 AM


Originally Posted by paulmasoner (Post 3807468)
it is a positive displacement pump. and its based on rpm, load

Do you know what the actual relationship is: ie step# vs. rpm/load?

mbitterman 12-15-2010 12:59 PM

I was always taught to check oil on a level surface and a cold engine.

PeteInLongBeach 12-16-2010 03:45 AM


Originally Posted by mbitterman (Post 3819672)
I was always taught to check oil on a level surface and a cold engine.

Mazda specifies checking the oil with fully warm motor, a few minutes after shutdown, and this is what the dipstick is graduated for. This facilitates regular checking when fueling the car. Oil expands / rises when hot, so if you top it off when cold you risk over-filling it.

Woody77 12-16-2010 08:37 PM

Digging around, I've seen .0004/deg F as the thermal expansion coefficient. For a 140f rise (40f to 180f), and a 7 qt system total (??) that's 40% of a qt of expansion.

Given that the oil temp is likely to be nearly the same (within 10f) every time on a 5min after shutdown, vs. the >100f swings in ambient during the year that some places have, it makes sense.

Of course, one way to deal with that 1/4-1/2 qt of change is just to keep the cold fill point at 1/2 qt low, since they so nicely provided that mark on the dip-stick. Although, one could also time your shutdown wait with how long it takes to fill a tank fully up.


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