My engine does NOT have an oil level dipstick. I have stared at my motor for dozens of minutes and there is no dipstick. It DOES have a tube going into the oil pan with an oil pressure sensor/sender installed on it. How do I determine my oil level? The pressure is good, but every motor uses SOME oil. I would like to know if I need to add an ounce or a quart. Thanks, long time lurker.