Oil change according to analysis only

Joined
Apr 27, 2003
Messages
70
Location
Austin, TX
Does anyone here change their oil solely based on indications of Oil analysis? For the past 3 years I've been on a 1-year change interval with Amsoil and without exception the oil is always suitable for continued use. The most I've gone in a year is 15K or so. Any thoughts on going until analysis indicates that a change is needed? Any perils associated with this? How long could it go? Thanks
 
Joined
Sep 13, 2004
Messages
1,904
Location
Canada
How long? 5-10 years or more, depending on usage. I think you will find people here are generally notoriously conservative, some even breaking out with anxiety and OCD dipstick checking once they cross the 3 month/3k mi brainwashed OCI that their grandfathers used that hasn't been recommended in any new car manual for the past 25 years.
 
Joined
Aug 16, 2003
Messages
1,533
Location
Ephraim
Nope, I very rarely ever do them any more. I just shoot for 10K and if the budget is not there or I need to go out of town or other life issues happen, then I change it whenever I can and most likely before 16K. Otherwise, if I know for instance, my last two OCIs were going to fall in the 14-16K range if I didnt change them at that time so the last two were at 8K each, the one now has over 5K and I did this to time it with my life issues, like court dates for tickets and for going to see parents and going to see Bro)In)law, and the likes I knew I had to change it then i.e. 8 or else be over for sure and not have an emergency cushion of a few K because of life. For me anything between 8-12 is On time, and Fine. You may shoot of 4-6-or 8K for your situation. I know from experience of many Oil Tests on similar trucks, what I can get away with, and I did several when the truck was new. And I'll run several between now and 100K or 120K to re-check things, but since mpg and performance has only gotten better the more miles I use my truck, just like most of mine, I feel safe [Eek!] [Eek!] [Big Grin] and if not, then you can [LOL!] [Razz]
 
Joined
May 23, 2004
Messages
694
Location
Saskatchewan, Canada
About the only time it would pay to do that is if you have a piece of equipment that holds alot of oil, such as a locomotive(400 gallons of lube oil!) For the average passenger car, it's cheaper to change the oil and filter than to do a UOA. I maintain a fleet of 7 passenger vehicles, I used UOA to determine what OCI was appropriate for the driving conditions. After that was determined, there's no economic benefit to doing a UOA each OCI just to see if I can eek out another 1k or whatever. But I will continue to sample my GM 3.4L equipped vehicles to check for coolant leaks.
 
Top