You guys act like it's 1972 in regards to getting the metalz out of your enjuns!
Originally Posted By: Jack_Kieran
Please do get the UOA on the FF Subaru oil coming out on this early change, and post it as soon as you get it!
With such an early oil change, the UOA would reflect both early wear patterns on your engine, and what the true characteristics of the Subaru FF are. It is not necessarily the case that the FF oil is the same as what Subaru provides for regular changes. Is the FF even a 0w-20?
It will answer some open and important questions. Especially: how much moly is in the FF oil? Is it in fact different in that regard from the Idemitsu -supplied Mazda 0w-20? Is the FF oil different than what Subaru provides at the parts counter? (Would need an up-to-date VOA on the latter to compare; I haven't seen one posted here but maybe I missed it). How does the Subaru FF oil compare to other high-quality 0w-20 oils that an owner might choose?
If you really wanted to get into the scientific weeds and do a controlled experiment, you could get a UOA on the RP you just put in after a putting in matching 782 miles on it, to compare the RP performance relating to wear with the performance of the FF oil. Inquiring minds would like to know!
A factory fill uoa will reflect early wear patterns in an engine? Really?
Great uoa article here.
I'd skip the factory fill uoa as you can just search one and they're basically all the same, especially over the last year or two.
A FF uoa will not tell you how much moly is in the factory fill oil since there is a bit of moly in the assembly lube as well. Over the past couple of years, the moly and ZDDP levels in Subaru 0W20 and the 5W30 in the WRX has dropped a bit and only the STI FF uoa's continue to show high moly and ZDDP (if the uoa's are accurate, that is).