Here is a post from an EX-GM Engineer who worked on the C5 Corvette:
we did almost two years of studies on the oil system and the oil life monitor system... we nailed it down to very spacific advice... we know for a fact that mileage has very little to do with oil life... you can take two cars and drive each 5,000 miles, one car drives in 6th gear or in high and the motors sees 1500 rpms for 90 % of the time.. the other car is driven around town rarely getting out of first or second gear... this car sees an average of 3000 rpm for 90 % of the time... the lubrication system sees twice the load in the car that averages 3000 rpm. but the OLM system take many other factors, let say the car that does an average of 3000 rpms aso sees many short trips, and cold starts this also effect the oil integrity...anyone who things using mileage as a means to change oil is living in the 60's. when people didnt know any better... we designed this OLM system to make oil changes idiot proof and to benifit the eco system.. also we know for a fact that once oil is run through an interal combustion engine it sets in motion a catalist that cause the oil, be it perto based or synthetic , to turn acidic.. this is why we say to change the oil when the oil life monitor says too or once a year.. the algorithims take away from the base line , like demerits...when we originally built the algorithims we made the base line 10,000 miles, things like cold starts engine rmps times etc all take a % off this 10,000 miles... after three years of field debugging we found that changing the base line to 15,000 was still within a ten & safety factor.. so you can take your oil life monitor down to 0% and still be within oil life. I advise people who pm me about this to get to 10% and start to think about changing their oil dont go past 0 % for more than a day or so..you want to do it within the week your car gets to zero.. and you do not want to leave the same oil in your car for more than a year.. we checked PH values and found that PH was high enough in 13 months to start acid etching, and gasket degregation..WE did thousand of hours of testing and yet some guys says her thinks its ok to go two years with the same oil... I can guarantee you that an engine with oil like this in it will never see 300,000 mile like all of our test mules.... and we are not talking lab mules we are talking car that are actually driven under all types of loads... Do yourself a big favor , take advantage of the hundreds of thousands of dollars used to develop this system.. its one of the best in the world...
I must make this speach one a year, every years when all these people think this is their grandfathers 55 Buick and say thats what my grandfather did BTW a 55 Buick was at the end of its days around 60,000 miles.. Believe me the technology is light years aways from a 55 Buick
See the bold, "and you do not want to leave the same oil in your car for more than a year.. we checked PH values and found that PH was high enough in 13 months to start acid etching, and gasket degregation."
My question is, with synthetic oil can't you run over one year? I have and my UOA was okay. Isn't TBN a measure of the oil's ability to nuetralize acid?
we did almost two years of studies on the oil system and the oil life monitor system... we nailed it down to very spacific advice... we know for a fact that mileage has very little to do with oil life... you can take two cars and drive each 5,000 miles, one car drives in 6th gear or in high and the motors sees 1500 rpms for 90 % of the time.. the other car is driven around town rarely getting out of first or second gear... this car sees an average of 3000 rpm for 90 % of the time... the lubrication system sees twice the load in the car that averages 3000 rpm. but the OLM system take many other factors, let say the car that does an average of 3000 rpms aso sees many short trips, and cold starts this also effect the oil integrity...anyone who things using mileage as a means to change oil is living in the 60's. when people didnt know any better... we designed this OLM system to make oil changes idiot proof and to benifit the eco system.. also we know for a fact that once oil is run through an interal combustion engine it sets in motion a catalist that cause the oil, be it perto based or synthetic , to turn acidic.. this is why we say to change the oil when the oil life monitor says too or once a year.. the algorithims take away from the base line , like demerits...when we originally built the algorithims we made the base line 10,000 miles, things like cold starts engine rmps times etc all take a % off this 10,000 miles... after three years of field debugging we found that changing the base line to 15,000 was still within a ten & safety factor.. so you can take your oil life monitor down to 0% and still be within oil life. I advise people who pm me about this to get to 10% and start to think about changing their oil dont go past 0 % for more than a day or so..you want to do it within the week your car gets to zero.. and you do not want to leave the same oil in your car for more than a year.. we checked PH values and found that PH was high enough in 13 months to start acid etching, and gasket degregation..WE did thousand of hours of testing and yet some guys says her thinks its ok to go two years with the same oil... I can guarantee you that an engine with oil like this in it will never see 300,000 mile like all of our test mules.... and we are not talking lab mules we are talking car that are actually driven under all types of loads... Do yourself a big favor , take advantage of the hundreds of thousands of dollars used to develop this system.. its one of the best in the world...
I must make this speach one a year, every years when all these people think this is their grandfathers 55 Buick and say thats what my grandfather did BTW a 55 Buick was at the end of its days around 60,000 miles.. Believe me the technology is light years aways from a 55 Buick
See the bold, "and you do not want to leave the same oil in your car for more than a year.. we checked PH values and found that PH was high enough in 13 months to start acid etching, and gasket degregation."
My question is, with synthetic oil can't you run over one year? I have and my UOA was okay. Isn't TBN a measure of the oil's ability to nuetralize acid?
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