Saw this on a different forum and couldn't help myself but to share this here once I saw it... my apologies if I should have put it in a different sub-forum.
I've got an '08 Cobalt, and up until recently, I've been doing mostly short trips and changing my oil every 5,000 km's. I use a factory filter and Castrol GTX conventional. I use the recommended spec all year (I can't remember what it is off the top of my head). Thing is, I've recently started a new job, and I'd say 90%+ of my driving is highway. Does anyone push their interval longer than 5k on conventional, or does everyone stick to it? The car does have 256k on it (again, in kilometres). I've considered switching to a synthetic oil (Mobil 1), with a factory filter, but seeing as the age of the engine and that I currently have no leaks.. I'm not sure if I should try my luck.
Originally Posted By: User2
And you'd be wrong, most conventionnal oil lose their viscosity and start to turn to tar after 3000 miles. Synthetic is the way to go especially if you have the cam actuators. You should switch to a synthetic oil filter if you switch to Mobil 1 and still follow manufacturers directions. Change filter after 3000 miles eventhough your oil is good to 10000 miles.
Originally Posted By: User1
What's the oil life monitor say to go to? Personally I would not worry about doing 5,000 (miles) minimum on a brand name conventional.