I've switched from M1 to Brad Penn and am wondering what folks recommend for an oil change frequency using this oil.

 

I do it once a year, usually at around 3,500-4,500 miles, depending on how much I've driven. Being that yours is a daily, I'd go every 5K.

Have you ever done an oil analysis? It may be a good idea to do that and see how your engine is wearing. The vendor I use (Blackstone Labs) also offers an option to check if all the active ingredients are still present, which determines how often you can change the oil.

 

+1 on the frequency. Brad Penn is not a special formula. It is just the good old traditional oil we used to use before they starting with the various additives for modern cars.

 

+1 for Blackstone/UOA (used oil analysis).

 

Thanks for the input.

I had done an analysis before, but just the one. I'll start that again. That will surely tell me the change frequency for m my particular car.

Cheers,
Dave

 

When doing oil analysis, you need to do it at each oil change so you can see trending. It doesn't always tell the complete story either. We had an engine with a rod bearing failure and the oil analysis from the oil removed from the engine at the time of dissassembly did not show abnormally high particles from rod bearing material.

 

Interesting. Do you think that the particles from the rod bearing were washed out in previous oil changes and would have shown up had the analysis been done? Or, do you think it was just missed somehow?

 

Geoffrey, I know oil circulates, etc, but I'd be curious if I were to submit two oil samples - one from the case and one from the tank and see if they differ at all. Do you have an opinion on this?

My initial comment on the oil analysis was to see the TBN of the old oil: http://www.blackstone-labs.com/do_i_need_a_tbn_.html