Quote:
Originally Posted by SubieNate
@ gpshumway-I did a ton of reading over at bitog before I bought my first oil change supplies. I'll be the first to admit I'm not a chemist. Just trying to add to the discussion. Probably should fact check a bit more. The NOACK quoted for PP 0w20 was in the 8.x range if I remember right. I did a bit more reading and it was either a typo or they changed the formula, the current value is what you said. |
You're not hallucinating. SOPUS just re-formulated both the Platinum and Ultra product lines, now calling them "Pure Plus". NOACK values went up across the board. Whether the overall formulation is better or worse is still an open question.
Interestingly, the product in the bottle may be better than what's on the data sheet. PQI America recently tested Pennzoil Yellow Bottle 5w20 and got a NOACK of 6.5%(!) so apparently SOPUS had some extra GTL base stock lying around.
http://www.pqiamerica.com/Feb2014/co...ed5w20ALL.html
Quote:
Originally Posted by qqzj
Thanks, for folks in warmer areas and other folks in summer, how would you rank the typically oils we can buy at Walmart for BRZ? Is it like this?
M1 5w20 > PU 5w20 > Gastrol 5w20 > PP 5w20 > Valvline 5w20 = Quaker State 5w20, and similar ranking for 0w20's?
I probably will switch to 5w20 after warranty is over and my current stock pile of 0w20 is gone.
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I would rank all of the oils in a given grade and category very similarly. Which is to say all the top tier synthetics are so close in performance it's pretty hard to tell them apart. So, Pennzoil Ultra, Pennzoil Platinum, Mobil 1 (incl EP and AFE) and Castrol Edge Extended (Edge Ti) all belong on the top tier. Synpower, Edge w/Syntec, and Quaker State Ultimate Durability belong one notch down.
But, the difference between top tier and 2nd tier synthetics is much less important than matching the grade to the expected usage. For a street driven 86 in a warm climate, a top-tier 5w20 would be a good choice.
Engines are actually less sensitive to operating viscosity than you might think. Honda says the R18 in my Civic is designed to run fine with 0w16, and judging by my factory fill UOA, they mean it. Yet the European Civic manual lists grades from 0w20 to 5w40 for any temperature range.
Given that, one could easily run a good ILSAC xw30 synthetic in a warm climate or even a HD xw30 like GC or M1 ESP.
This all assumes the owner is not concerned about a non-recommended grade causing denial of warranty coverage. Luckily the 86 has convenient language about using thicker oil for high temperatures, hopefully that saves an unlucky owner's bacon.