http://www.volkspage.net/technik/ssp/ssp/SSP_224.pdf
It's not just the Chevy volt that says 2 years is OK, both VW and Audi have now switched to 2 year maximum oil change intervals if you are using a fully synthetic oil.
Some of the big rigs that use bypass oil filters don't change their oil for years, as modern engines are much more tightly sealed and modern oils don't degrade at anything like the rate of the old dinosaur ones.
Originally Posted By: bigjl
I don't think a Chevy Volt is a viable comparison. The engine in the Volt is not connected to the engine and is purely there to act as a generator to charge up the batteries.
There is also. The point to consider the actual length and terms of a new car warranty.
Most are three years.
So what is the chance of engine wear being problematic in 3 low mileage years?
Next to none.
Does doing extra OC's invalidate the warranty?
No.
Is an engine cheaper than a $30/40 OC?
No.
Sometimes best practice is different to minimum required to conform to warranty conditions.
The purpose of minimum warranty specs is to show the least amount of maintenance needed to get through the period of cover.
Not what is the best maintenance schedule to ensure long term reliability of the vehicle.
Some may not agree and that is fine.
But doing an annual rather than biannual OC is better for the vehicles long term mechanical health.