klw084 wrote:I have an interesting story regarding this topic.
When I purchased my last car, a 2013 Honda Accord, there was an offer for bulk oil changes for 2 years. If you purchased it and, as the salesman said, get your oil changed every 3-4 months, it's a great deal for the 2 years the offer is in effect. Since I normally changed my oil when the dealer told me to, I agreed it was a good deal and so I purchased this option.
After three months, the first time I tried to change my oil and called the service department to schedule maintenance, the response I got was, what does your oil indicator say? I guess more modern cars now have an oil indicator that tells you the percentage of oil life you have left and their recommendation was to not get the oil changed until there was around 15% oil life left. So they refused to service my car.
This was news to me and I realized that I had been somewhat hoodwinked when I purchased the 2 year oil change option. So, I got my car oil changed when the car told me to.
When the 2 years were up the next time I brought my car in for an oil change, suddenly the dealer reverted back to the "you need to get your oil changed every 3-4 months" line.
I hope the lesson I learned that day can help others on this forum. You do not need to get your oil changed every 3-4 months. Most modern cars now have an oil life indicator. There is no need to get your oil changed until the indicator goes off.
I get synthetic oil put in my car so I can go longer without oil changes. I usually go well over a year before I get my oil changed now. Furthermore, I get my tires rotated at the same time they change my oil (at a local garage I trust, no longer at the dealer). The total price is around 80 bucks. This and the major maintenance at 30k is the only thing I do on all my family cars now.
Short term thinking on the dealer's part. They taught me a good lesson and, while I did pay for it, in the long run they wound up saving me tremendously more money at their expense by educating me on not taking their "recommendations" at face value and what actually is and is not necessary.
Clearly the dealer is inconsistent with their advice depending on whether they are paying for the service or profiting from the service, be careful what you conclude based on the self interested advice of the dealer! If are were willing to lie to you regarding the need for 3-4 month oil changes irrespective of mileage when they're profiting, doesn't it also seem possible that they are willing to lie about the safety of extended oil changes based on the oil life monitor when they're paying?
Things that I'd be concerned about:
1) Whether proper oil that is "assumed" by oil life monitor was actually used in the vehicle - worse oil may result in less life than the monitor expects (substituting in cheaper oil is a somewhat common scam at oil change places)
2) Whether oil life monitor is optimized for long life of vehicle or to minimize operational costs to 100.000 miles (cost to $100k is a common rating / buying metric)
3) Whether oil filter uses meets oil life monitor expectations - again OEM spec is not always followed by oil change place.
For most practical purposes, oil life monitor recommendation is likely fine to follow, but may not be appropriate for those looking to keep a car for an extended period of time, or those who can't be sure properly specced oil & filters are always used in the car.
I'd hate to see you or others arbitrarily fixate on one of a lying dealer's stories with unintended consequences.
That being said, your big picture point is almost certainty correct - oil changes are over recommended by service writers.