2001 Grand Marquis, 178K miles, driven on interstate 80 miles/day. Don't really give a flip about this car, so I want to do the bare minimum to keep it functional.
So, having "almost free" Mobil and PYB oils at hand, I do 5000 mile changes on my nice Honda Odyssey, while the OLM usually indicates 40% or 50% life remaining. Thinking that this used oil could almost go another 5000 miles (if I wanted to push it), I drain and use 4 quarts of it, then add two new quarts to make the 6 quarts total needed for the Marquis oil changes. I think the 2 new quarts boosts the TBN and additives enough to get by.
I use a cheap but decent quality filter like NAPA Silver or FL820s for 10K intervals. My cost per change is less than $5. The Marquis seems to be surviving...so far...LOL.
So, having "almost free" Mobil and PYB oils at hand, I do 5000 mile changes on my nice Honda Odyssey, while the OLM usually indicates 40% or 50% life remaining. Thinking that this used oil could almost go another 5000 miles (if I wanted to push it), I drain and use 4 quarts of it, then add two new quarts to make the 6 quarts total needed for the Marquis oil changes. I think the 2 new quarts boosts the TBN and additives enough to get by.
I use a cheap but decent quality filter like NAPA Silver or FL820s for 10K intervals. My cost per change is less than $5. The Marquis seems to be surviving...so far...LOL.