I think that for cars that will not go 5,000 miles each year and/or have an oil change, that the most reliable method is to have a sample sent for testing if you are considering a longer time period than 1 year.
Just my 2 cents. Cheap insurance.
I change mine between 3,000 and 5,000 unless on a long trip where is is driven every day.
Just my 2 cents. Cheap insurance.
I change mine between 3,000 and 5,000 unless on a long trip where is is driven every day.