Originally Posted By: StevieC
Here's a story for you...
Before I was a BITOG member and my Santa Fe was new (after break-in) I used Mobil 1 Synthetic 5w30 and changed according to the owners manual at 6K KM (3500 Miles) not knowing any better I did this for 80K KM (50K miles). When I bought the Santa Fe I bought a ton of M1 because I had a way of getting it cheaper than retail at the time. (no longer have this connection) I literally had about 20 jugs.
I joined BITOG and learned all about used oil analysis etc. so wanting the best for my truck I did a used oil analysis. I got back the results and all the numbers were in check and quite low (including iron at 8ppm).
I kept using Mobil and then I read about the hoopla that apparently they had changed to GRP-III as a part of or as their main basetock for oil. Thought nothing of it at the time.
So I get to the end of my warranty with Hyundai at 100K KM (60K miles) and I see this stuff called Amsoil. So I thought I would try some. I buy the SSO stuff which is just new and put it in for a couple of changes and do a used oil analysis. I notice that the wear numbers on the used oil analysis are slightly lower but the Iron is almost in half at 4ppm. I figure this is good so I want to keep using it and seeing as I don't have Mobil left I continue on.
Then I read here about all the Iron spikes etc. and this has got me curious.
So one OCI later I dump my Amsoil and put back my trusty (good until this point) Mobil 5w30 back in. I run it for 6K KM and dump it out, then refill with more and drive to 6K KM and send in a used oil analysis. I get back the results and the Iron is at 48ppm!
Scared for dear life, and before reading Doug's article I empty it out and put back in my Amsoil and drive it 6K KM and do a used oil analysis and it's back to around 4ppm again.
Very happy that I adverted disaster I check the next fill of Amsoil and again I see 4ppm.
I then read Doug's article in the meantime and see that higher Iron PPM doesn't necessarily equate to higher wear.
I put Mobil back in for one last try and again it tests around 40ppm.
While I didn't notice any performance change or metal filings in my oil pan, on the drain plug or in my EAO filter with FilterMag there is definitely something spiking these numbers in my engine when it comes to Iron and I just can't sleep at night IMO, taking a chance that I could be risking the engine with these numbers.
So I switched back to Amsoil and stuck with it. Since then I have tried Pennzoil Platinum and some Dino's that peaked my interest and none of them that I had a used oil analysis done on showed the Iron levels that M1 did.
I'm not saying that this in anyway equates to M1 causing wear, but I sure as heck am not going to see in time what happens.
If Amsoil isn't that much more than M1 and doesn't report those same elevated numbers to me it seems like a logical choice.
Cheap insurance I guess...
Details are here in this post above...