Quote:
Originally Posted by bluesubie
BITOG - Why iron ppm numbers are not good wear indicators.
I don't think this is the case. I've never heard of wear becoming so bad that the oil cannot protect the gaps between moving parts. I recall a trend of uoa's on nasioc several years ago on a high mileage WRX. Lead jumped up quite a bit and it was speculated that a bearing was going out. OTOH, I've seen uoa's on cars with 250,000 miles and uoa wear was lower than similar cars with only 50,000 miles.
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I know that iron is one of the few wear materials that goes up linearly with the miles of the oil, but the increased iron wear is kind of like what Nickosport was saying, there are a lot of parts that contain iron.
The concept is basically gaps become so large that you get increased vibration and metal-to-metal contact, this can happen anywhere. Vibration also increases heat, especially at the speeds that engines are running at. This combination basically thins out your oil film, and therefore, reducing protection.
All-in-all, I'm just trying to debunk some oil myths and look for a potential oil brand to go with. A lot of people say you can't mix brands because of the additive packages, which true, but all oils need to abide by some sort of standard, and I'm beginning to think perhaps oils aren't that different.
The problem is, a lot of my data was during the break-in period, so technically can't do an apples-to-apples comparison until I get more data. Hence wondering if there was a correlation between engine life and amount of wear material.
Take a look at my oil analysis of different brands and even mixes. Did not find anything out of the ordinary. M1 EP, Kendall GT-1, RP. I plan on trying out M1 AFE and Pennzoil Plat, and probably RL and Motul later down the line. I guess the only thing that was a bit strange was the GT-1, where my oil consumption went higher than the other brands. I'm hoping the liquid Ti is worth the Ti-plating and saving my cat. Molecule from bitog also couldn't find any conclusive answers on Ti vs Moly-plating, but I'm pretty sure I'm done with GT-1 after I finish the rest of my inventory.
I'm probably going to keep track of all my oil analysis, even after the 60k mile warranty, and maybe I'll be able to get some real hard data. I have a heavy foot and drive pretty consistently since this is my daily. Maybe plot in a graph by material?