bad if the engine oil not sythetic??

[Donkey]

Welcome all you want to know about oil and more.

[Sasquatch]

Welcome all you want to know about oil and more.

Hey ... I'm registered there. Haven't logged on in a while.

[Donkey]

i dont really like that considering all oil gets dirty just as quick whether its $20 per quart godness or $1.50 per gallon generic vegetable oil. dirt and the leftovers of combustion are the main reasons for changing oil. personally i use castrol edge and change it every 4000

My wifes 01 Honda Civic recommends synthetic 5W20 with an OIC of 10k with a filter swap at 5k. It's also not just about getting dirty,it's about the oil breaking down/shearing and the additive package failing. Also a quality filter helps as well.

[SD_GR]

My wifes 01 Honda Civic recommends synthetic 5W20 with an OIC of 10k with a filter swap at 5k. It's also not just about getting dirty,it's about the oil breaking down/shearing and the additive package failing. Also a quality filter helps as well.

A 5W-20 will, unless I'm mistaken, be at least a semi-synth due to the viscosity range -- at least that was the market when I started shopping for them in 2007. My wife's Honda Pilot has a maintenance minder and also uses 5W-20; it asks for oil changes usually every 7,000 miles or so and filter changes every other oil change, meaning around 14,000 miles.

Long intervals that are still safe are IMO a good thing. It's progress. It's smart. Contrast with Subaru, who started off OK at 7,500 mile intervals, then made a mess of people's motors with their little screens etc., and issued that TSB saying "turbo cars go to 3750 mile intervals." Disgusting. Bah!