I've got the option to obtain some synthetic 5w-40 oil(VW 502 00/505 00 and Porsche approved) at a very low price. It would be used in a Mazda3 2.0 that is spec'd for 5w-20 and changed at 12,000km intervals (after the warranty period expires).
Are there any downsides besides potential loss of fuel economy ? Anyone think there's any danger to the engine aside from possibly a couple MPG and a couple horsepower?
Are there any downsides besides potential loss of fuel economy ? Anyone think there's any danger to the engine aside from possibly a couple MPG and a couple horsepower?