Originally Posted By: bobbydavro
Originally Posted By: Joe90_guy
Yes. Correct. Shellvis is polymerically more efficient but last time I looked (a couple of years ago maybe?), in crude terms, Shellvis was cost equivalent to Lz OCP + 20% Group III. If you factor that in to the equation, then the apparent advantage for Styrene-Butadiene evaporates before your eyes. Also, while I'm happy to concede that in 15W40 Euro HDDO, even after you take into account cost equivalence, you might still opt for Shellvis, drop down to any ACEA 3.5 min HTHS xW-30 and Sv looks pants!
No sure I agree with this. I guess you experience is from HDEO oils with high viscosity and low cost targets
SV certainly isn't pants in xW-30 grade (or any grade) top tier PCO oils. Here you are all group III anyway so the 20% addition is irrelevant. In fact on 10W-40 you usually need more group III when formulating with OCP.
Some of the best oils on the market go no where near OCP. OCP is a cost orientated low/mid tier option speaking in general terms.
A telling answer. Am I right in thinking I'm exchanging messages with a bonafide, fully paid-up member of the Milton Hill Mob? Oh joy!
So, Sv 260 (or whatever it's been rebranded as) price vs Lz 7069 price. Twice? That's what a little bird told me. Given that there's never ever enough Sv to go around, maybe twice is an under-estimate! Do the viscometric maths. It doesn't matter that it's all Group III. You can take the credit as Group IV and you end up with much the same answer.
As regards xW-30s, I did specifically say Euro 3.5 min. When oils are HTHS limited (as opposed to KO30 limited), Sv 260 is just too fragile. You end up massively over-compensating on KV100 to make 3.5 (or the 3.45 you usually round up to 3.5). Put this together with the economic credit and Lz wins. Yes you can improve the HTHS performance by shearing down to Sv 250 but then you lose a lot of your polymeric efficiency advantage.
Yeah. I know a lot of top tier uses Sv. Proof it any were needed that some folks have more money than sense...