This one always makes think back to the days when working part time in a filling station,then there was some very cheap
oil and quite a few people that regularly came in never changed theirs. These engines lasted a lot longer than the cars they were sitting in.
Always used synthetics and several times had
oil analyzed never any issues.Daily drivers get changed once a year,Everything else depends on usage,certainly not every 3000.Motorcycles,tractors,and Cobra may go several years depending on usage.We enthusiasts have a much better feel for our equipment than the average joe for what works and what does not.I for one never take anything for granted truly enjoy maintaining all that we own,the reason is that good feeling I always get cruising through the shop knowing all the machinery is ready to go and 100% in tip top shape.The investments we have in our beloved creations is worth every minute spent keeping them in top working order.