AggregatVier

So where does Kendall GT-1 fall on your chart?

Audi Junkie

You can have a lower FP and ALSO lower sulphated ash and get the same, or better results. Reason why, say an oil encounters an area of the engine over it's FP.(unlikely except ring pack) If it burns off (totally normal) it can leave a lot of SA behind, which is typical of high VI and FP ~or~ it can burn off normally and leave small amounts of SA. As for HT/HS, once you have sufficient boundry layer, more does no good. Would putting Kendall Nitro 70 in a Civic protect it better? No. It has a higher HT/HS then the Honda spec 5w-20 though. It is all a matter of tuning HT/HS to engine design...all oils from M1 30 weight (HT/HS 2.9) to Syntec 5w-50 (HT/HS 4.5) will protect fine. The only way to tell what is going on between the two is compare UOAs showing wear metals. Probally NO difference, but you sacrifice power and MPG with the high vis oils. The heavy oil might actually protect worse. A complicated issue. Keep the database organized, but keep in mind...there is much, much, more to overall oil preformance than specs. Any oil that has a 30 weight designation protects with a HT/HS of 2.9, whether it keeps it's viscosity, another story. Can't tell by starting specs. It takes a 3.5 for ACEA A3...which is the baseline for VW 502, 503.01, MB 229.3. So you can say any A3, VW 502, MB 229.3 oil will protect fine. What is interesting, the MB 22*8*. 3 spec is identical to 229.3 except for cold-cranking and mpg stipulation...most $1.50 15w-40 oil carry this Mercedes-spec. Spend some time on the oil Forum, your questions will be answered much better there.

bhvrdr

very nice. thanks.

bhvrdr

that's why i put the big warning at the top of the page, otherwise it would appear everyone should be running Redline 15w-50 in their cars and that's not the case for the majority of drivers. But, wouldn't comparing within the same viscosity range give you a pretty good idea of what motor oil is going to be of higher quality if you had to predict what the oil analysis would tell you over time? Thanks for your input in advance. Mike

Audi Junkie

I think the more I learn, the more I realize I don't know or understand. Currently running Havoline 5w-30 to de-ester my engine seals. (cloaked Chevron Supreme, a GII+ with the latest add pack)Then is off to Rotella 10w-30 and possibly either Rotella 5w-40 syn or Saab Synthetic 0w-30 if my seals are up to it. (a whole 'nother issue) Sticking with my recommendation of Mobil 1 SUV 5w-40 over M1 0w-40 and maybe GC, except for MPG and super-cold cranking. Def the ticket for chipped cars and long OCIs. Do you mind if I link to your compendium?

bhvrdr

I checked out that Delvac on your recommendation and it seems to compete just fine. Not bad for the $$$. Talk to you soon. Mike

Audi Junkie

And the final frontier...seal compatibility... or it it metalurgy next??? I'm really just a sophmore Triboligist. My College study was History & Sociology of Science, so I enjoy dechiphering a tricky scientific subject like Tribology. Just look at the technical specifications for oil certs, what a pita.