I have a Frantz on the motor last oil change was at 145,000 when I did the intake manifold gasket. I started with mobile 1 5w30 and changed the tp roll every 3,000 miles with scotts 1000 TP and whatever cheap oil I had laying around (supertech,shell,havoline). The truck started to leak a few drops of oil overnight on the new driveway so I decided to add a bottle of auto-rx to see if it would help at 20,000 miles into the run the oil was pretty clear on the dip stick just a light brown color. Left the Auto-RX in there for 2,000 miles and the oil started to look pretty dark so I finally changed it tonight. 22,000 miles since the drain plug was removed 167,203 miles on the truck. If the oil leak continues I'll change the stock remote oil filter/cooler lines (AGAIN, did them 3 years ago with the newer dorman 3 crimp style lines). I was gonna do an oil analysis but just didn't want to waste the money since the auto-rx was in there and figured it would screw up the reading maybe. Just thought someone might like to know.
Finally Changed the oil 22,000 miles 4.3 Blazer
- Thread starter iceberg
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What? You just about got to a steady state on the sump
That's about how long it takes to get the original sump to be the below the % of newer oil in the engine.
Good show!! So, essentially, if we threw out the M1 and just counted your original sump and your adds ..you used 12-13 quarts for 22k ..or nearly 2k per quart. Compared to a 5 quart sump ..that would require somewhere around 9-10k to match it in value ...if I'm reasoning it correctly.
Good show!! So, essentially, if we threw out the M1 and just counted your original sump and your adds ..you used 12-13 quarts for 22k ..or nearly 2k per quart. Compared to a 5 quart sump ..that would require somewhere around 9-10k to match it in value ...if I'm reasoning it correctly.
So the oil really was not the oil that was put in it at first! But it is a good method, one of many that work and have been proven.
How often did you change the full flow? this would add into the calculation.
How often did you change the full flow? this would add into the calculation.
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It takes a long time to get rid of the original sump.
4+1 for the tp filter (easier math)
100% new oil
3k 80% 3k 20% new oil
6k 64% 6k 16% 3k 20% new oil
9k 51.4% 9k 12.8% 6k 16% 3k 20% new
12k 41.1 12k 10.2 9k 12.8 6k 16% 3k 20% new
15k 32.9 15k 8% 12k 10.2% 9k 12.8% 6k 16% 3k 20% new
18k 26.3 18k 6.4% 15k 8% 12k 10.2% 9k 12.8% 6k 16%3k 20% new
21k 21% 21k 5.1 18k 6.4% 15k 8% 12k 10.2% 9k 12.8% 6k 16% 3k 20% new
at about this point ..the oldest oil starts moving down in % with the new quart of oil.
Original oil
21k 21%
24k 16.8%
27k 13.4%
30k 10.8%
33k 8.6%
36k 6.9%
39k 5.5%
42k 4.4%
A simpler way is to just start with 5 and work your 80% down to where you feel good about it
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