How long does oil last? What I mean is, does oil have a shelf life? Does it Go bad? Does it break down?

I just don't know and if I don't ask I will never know.

I bought oil over 9 months ago for my L and never used it do to the truck going into the shop for new motor. Should I use the oil I have at my house or buy new oil? Mobil 5-30 with pureOne filter.

Sorry for such a dumb question.

~Eric

 

DO NOT PUT SYNTHETIC IN A NEW MOTOR. If it's not synthetic you'll be fine using the stuff you have.

 

Why not? What's wrong with putting synthetic oil in a new motor?

 

It's not synthetic, so thats great to hear that I don't have to buy new oil.

 

Check the born on date on the bottle.

 

The rings won't seat if you use synthetic.

 

what about vehilces that come with synthetic from the factory?

 

So does synthetic oil go bad if it sits around a while, like 4 – 5 months?

 

What vehicles would that be?

You should never use synthetic oil on a new motor durring break in.

 

For starters, the 2000 Cobra R. Along with most LSx motor cars, BMWs, and porsches.

 

Ok, Bringing this back up. i was cleaning out some cabinets that my grandfather had full of stuff. I found a 5 Quart jug of 5W20. Grandpa hasn't lived with me in about 5 years. The Jug is full, and sealed. Is it still good?

 

Mobil says that the bottle will break down long before the oil it contains. As long as the container is sealed to prevent contaminants or water from getting in the oil should be fine.

 

i dont see why you cant use synthetic oils too like mister said alot of high perf cars come with synthetic now and they do have motor break in oil that you can use before you put the good stuff in

 

synthetic oil dosnt do anything for heat all it does is lubercate. Regualar motor oil will fight against engine heat and lube at the sametime. I have always heard never to run syntetic oil in a new motor also.