Originally Posted By: Kuato
Originally Posted By: surfstar
My cars come with 80k miles to start. No engine failures yet.
It's a judgement call. If there's some bad internal part in your engine and it fails in warranty, in theory the car company will cover it, IF you have adhered to their maintenance schedule.
If a $4k+ engine is easily within someone's budget they can run whatever oil they want.
However for most folks I'd imagine that paying for a new engine when the warranty would have is enough incentive to go by the oil recommendation.
I've never had to have warranty work done on any car we've ever bought new, four of them Hondas, one a Subaru and one a Ford.
We've certainly never had an engine failure in any vehicle at any mileage.
However, let's say that something really bad happens to one of our cars engines while still under warranty.
Do I really want to get into a peeing contest over why I used an oil grade or spec outside of OEM recommendation?
There are those botique blenders who claim that they'll stand behind you on any warranty denial, but do I really need to go through a protracted process to get my engine fixed or replaced?
I'd also spend more on a lawyer myself than I would just buying a replacement engine.
The manufacurer would still have more legal firepower than I would.
The answer is simple.
If you want to be able to use the warranty, use the recommended oil.
If you really don't care, use whatever you want.
The warranty is part of what you pay for in a new car.
Why put it at any risk?