2016 Mazda CX-5 GT AWD w/Tech Pkg
- Plano, Texas, USA
Thanks for verifying this. I did the same experiment on my CX-5 and found the same result. It doesn’t make too much difference when you check the oil level AT LEAST 5 minutes after engine shutting off, or the old fashioned way checking the oil level the first thing in the morning before the engine start. The good part for latter is you can see the oil mark on dipstick much easier without even a wipe to the dipstick.A half a quart of gasoline diluting the oil would be a serious problem. Even a few ounces would indicate a big problem. I have also checked my oil hot, like within a half hour of a drive and stone cold and there is zero difference in the level on the dipstick. Regarding fuel dilution, the oil level on my CX 5 has not moved any measurable amount up or down in the 2600 miles since the last change. And I make a lot of short trips, like 10 mile round trips into town which qualifies for severe service.
Change the oil every 5000 miles using good synthetic even though you may be tempted to go 7500 miles. And try to get the engine good and hot every couple of weeks if you make a lot of short trips like I do and you shouldn't experience any fuel dilution issues.
The reason? More oil drained back to the oil pan over night to compensate a little smaller volume on colder oil.
My CX-5 doesn’t seem to have any oil dilution issue, and the engine does burn some oil between each oil change. So I want my oil level at Full mark after each oil change to have more safety margin.
Oil dilution issue by the gasoline on our 2.5L seems to be happening in colder environment based on a few complaints we have seen here. In Texas we shouldn’t see this problem too often. Many friends in Dallas area are having infamous Honda 1.5T‘s and none of them have suffered oil dilution issue.