Quote:
Originally Posted by White_SS/RS
for 5 gal. yeah thats a great deal!
The cSt of the 30wt is 10 and the cSt of the 5/30 is 11.9 so the 30wt essentually is a lighter weight, close to a 20 but maintains that higher HTHS of 3.7 like its RL 5/30 brother and M1's 0/40. For reference M1 5/30 is 11cSt @ 3.1 HTHS and M1 0/40 is 13.5 cSt @ 3.8 HTHS. I had to call Redline to get the HTHS of its 30wt since they dont have it in their literature.
In basic principle (and your aware of this already) the cSt @ 100c is the oils flowing ability at 100c and the HTHS is its ability to maintain its oil film strength. So witnessing higher temps using M1 0/40 over their 5/30, it got me thinking, along with a lot of research on lowering oil temps, that what the engine needs is higher film strenght matched with a viscosity that flows well to reduce temps.
M1 5/30 worked good for me, maintained good oil pressure; temps were still 290 but the oil analysis showed it was protecting, I still felt there is more on the table. So I started looking at 0/20's more so with Redlines 0/20 which is practically a light 5/30 with a cSt of 9.1 but the HTHS wasn't there (2.9) and 9.1 cSt would probably have the low oil pressure light on at idle sitting at 270*. Thats when I started taking a look at race oils and low and behold (go figure) the possibility of a low cSt and higher HTHS would be possible. Enter the 30wt...
I haven't fully decided yet. Like your concern I need to do more research on the effects zinc, phos, moly have, not only on the cats but also other items.
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Just so you know, looks like regular Redline 5W-30 also provides great HTHS at 3.7, and it's a little thicker than Mobil 1 5W-30, and is also dexos1 approved:
http://www.redlineoil.com/product.aspx?pid=2&pcid=21