98 with 85000 miles, driven 3000 miles a year mostly in town. On board computer shows 45% after 3000 miles and one year.
Would you change it?
Thanx!

 

No Manufacturer of Cars or Oils .... Even AMSOIL recommends going beyond 1 Year oil change intervals
(Unless doing Oil Analysis). Especially with just short driving, oil never gets hot enough to boil off water vapor.

 

Don't forget to reset your meter after changing - then repeat.

 

 

The c7 oil life meter incorporates a time function as well. So after 1 year with no driving at all, my understanding is it will show 0% oil life.

 

Good implementation, I wonder if C5's or C6's monitor does same thing

 

Im 99% certain that the C5 does not and im also 99% the C6 does not either as I believe both systems are the same with limited functionality through the DIC interface.

 

A Yes from me...

 

Yes.

 

I am in the same situation I change every year. Cheap insurance.

 

Just change the filter i was told this by a Mobil engineer oil is good for (high mileage) 15,000 miles. The color of the oil means nothing , just rub off your dip stick between your fingers for dirt, grit metal deposits. I know motors are not cheap, just do what you feel is correct.

 

Yes, change it. Once the oil becomes contaminated with moisture, debris, deposits, etc it will slowly break down. That is why oil change intervals are always "xxxx miles or 1 year, whichever comes first".

 

Oil has worse things in it besides water/moisture that's not burned off. It also contains acids as acids are also a by-product of combustion. The longer it sits, the more damage it can do.......

 

Mobil 1 just came out with a 20,000 mile oil. This is a high mileage oil for all those old Corvettes . You can change your oilevery 10 years, but i would change filter once a year. Some one should ask them if this is on the 20,000 mile container. As i was told at the Museum in 2000 a Mobil representive said and had on display a 350 chevrolet motor with 250 thousand miles on it and only filter was changed every year! Motor was broken down and looked like new!

 

That may indeed be true, but I'm sure that there were some caveats that were left out. Most people either know, or should know, that moisture is a big detriment to the life of motor oil. The moisture gets into the oil when the engine is shut down, and the air in the engine cools, and forms condensation on the cylinder walls, and then is "scooped up" by the pistons, when the engine is restarted.

This condensation will "cook off", but only if the engine is allowed to fully warm up, and then run long enough to turn the water into vapors, which are either burned or drawn off by the PCV system. A bunch of "short hops", which unfortunately many of us do, is what kills the oil. As an example, and this goes back 40 years, I took a vacation, which involved driving approximately 2200 miles, over the course of an 8 day period. The night before I left on the trip, I changed the oil in the car, which had a small block Chevy engine. The car didn't use any oil at all, verified by several checks during the trip. When I returned home, the oil still retained it's golden, semi-translucent color.

Although I followed a fairly strict, oil and filter change at 2000 miles maintenance schedule with the car, I thought that I'd let it go a little longer, this one time, since I had just changed the oil a week earlier. By the time I had gone another 500 miles, at my normal driving cycle, the oil had gone dark brown. Why? Because the oil wasn't seeing the condensation "cook off" that it had seen in the previous week's extended driving.

My point? Although I'm not a chemist or an oil engineer, I think that oil, especially today's formulation, will last almost indefinitely. But no matter what the claims are, I think that the average driver's driving patters will degrade the oil in somewhat short order. Therefore, you'll still need to change it regularly.....Just my $0.02 worth.....

 

But was it oil as Mobil 1 as it is today? Before Mobil 1 the other oils were by products of the earth not the oils we have today which will last for ever. Color means little it is the texture of the oil as you rub it threw your fingers. We use this as a lubricate not a seperation of water. Why would Mobil 1 make a claim to 20,000 miles on the oil ? I do not think they want open law suits! I will try to contact them today for the more oil they sell the more profits they have!

 

LOL at thinking mobil 1 is a 100% group 4 synthetics.

It's not. Thats why it's labeled "full synthetic" and not "100% synthetic"...

And you nailed it "the more oil they sell the more profits they have"...