![]() It will have a certain base-oil KV100 and base-oil viscosity index VI - before the VII is added. You take a base oil plus a DDI package before you blend in the VII. but so does vii.Īre you saying htfs is independent of delta? Maybe he can elaborate.Īnyway I'm just analysing that data and not saying it's wrong or right. So I am thinking there is some indirect relationship there but Gokhan is saying "htfs only depends on the base oil". However, an inferior base oil will require higher vii (amount is delta dependent). Whereas it's hths is significantly higher. ![]() So 10W30 htfs is getting punished by it's base oil per Gokhan. Kind of makes sense since typically 0W oils require a better base oil dealing with lower temps. the 10W30) has a less vii even though both have a delta of 20. Good base oils will result in a natural higher vi oils with less vii. I think if the base oil is not very good, it will ultimately result in a higher vii oil. Less delta doesn't always necessarily mean less vii.Īmount of needed vii (vm) depends on the base oil as well as delta. Again, use the calculator for estimates only. Their monogrades give 2% error in the VII content, and I am guessing the HTHS and/or KV are inaccurate. ![]() They were also giving the density in lb/gal with only two significant figures in the SN PDS. Unfortunately Valvoline doesn't seem to be meticulous about its PDS's and there are errors etc. I have now entered both the SN and SP oils in the spreadsheet. Therefore, consider everything as an estimate only. HTHS probably has at least a ± 0.1 cP error, and KV40 and KV100 likely have significant errors as well. Keep in mind that the data in PDS's are not very accurate at all. (You can calculate it using the last two columns.) In other words VAS 10W-30 uses a lower-quality base oil such as Group III as opposed to a higher-quality base oil such as Group III+ or GTL in VAS 5W-30. VAS 10W-30 has a lower base-oil viscosity index VI than VAS 5W-30 according to the calculator. What other basic "summary information" can be concluded from comparing this group of oils to each other? So is it the higher VII Content in the 10W-30 that is lowering its HTFS? It looks like the 5W-20 would protect better for wear than the 10W-30 since its HTFS is greater than the 10W-30. Looking at the HTFS = BO DV150 column, it's happens to be rating them from low to high HTFS, with the 5W-30 giving the largest HTFS value. So I grabbed the Valvoline Advanced Full Synthetic section from your table - see below. I don't think there is a need to run a 15W-40 with a very high HTFS unless the engine is prone to wear, and most people would be OK with the recommended viscosity, and they can have an extra degree of assurance against wear by picking an oil of a given OEM recommendation with a higher HTFS (= BO DV150). So, basically pick an oil with a high HTFS viscosity (= BO DV150) to help reduce the engine wear. Therefore, minimizing the engine wear and maximizing the fuel economy contradict each other. For better fuel economy, you want to minimize the HTHS and also maximize the effective VII content (= minimize the A_Harman index), in other words minimize both the HTHS and HTFS, which also means maximizing the viscosity index VI since you're maximizing the VII content.For less engine and turbocharger deposits, a smaller effective VII content (= a larger A_Harman index) might help. ![]()
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