Couldn't you change the oil and filter when the oil on the dipstick is darkened.
From the chron.com
The car does not have an accessible dipstick, so I can't determine its oil level.
From the online.wsj.com
In fact, some imports do not have an engine oil dipstick for checking levels.
From the washingtontimes.com
During the past two oil changes, she was told that there was no oil on the dipstick.
From the washingtonpost.com
The dipstick had no oil on it, and it took four quarts to get it full again.
From the washingtonpost.com
Who is the dipstick that edits and prioritises stories for these programmes?
From the guardian.co.uk
Patients can test for hyperglycaemia by carrying out a urine dipstick test.
From the sciencedaily.com
So, if the RNA is present, it sticks to the dipstick DNA and the red dye is activated.
From the newscientist.com
It is a marvelous dipstick into 18th-century British society as a whole.
From the washingtontimes.com
More examples
A graduated rod dipped into a container to indicate the fluid level
A dipstick is one of several devices dipped into a liquid to perform a chemical test or to provide a measure of quantity of the liquid.
A stick or rod used to measure the depth of a liquid. Often used to check the level at which a liquid in an invisible tank stands; gauge; A penis; A useless person; A dipshit; A person of inferior intellect or, more accurately, someone who makes an action that would imply this
The dipstick is an instrument used to calculate the elevation profile of the road.
Slide prepared with appropriate growth media, dipped into MRF, and incubated to measure microbial growth in MRFs. Relatively inexpensive, easy to use, and available commercially.
The metal rod that passes into the oil Sump it is used to determine the quantity of oil in the engine. The oil level is marked on the rod and matches level indicators on the rod. Dipsticks are used to check engine oil and Transmission fluid. ...
A static, inclinometer-based proprietary device used to measure elevations at individual points (originally used for measuring floor flatness).
Someone deficient in intelligence and personality.