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another question for you about the name of synthetic-blend.
From what I experienced before, I always knew that there were 3 types of oils for standard passenger cars:
a) Mineral oil
b) semi-synthetic
c) synthetic oil
Where the hell is synthetic-blend in this list??
According to mobil 1 and some other sources it is the same as semi-synthetic:
http://www.mobil1.co.in/academy/what.aspxThere are also semi-synthetic oils, which are a blend of synthetic oils and conventional mineral oils. Semi-synthetic oils are also sometimes called "blends".
You, however market a blend as a Premium Synthetic oil:
http://www.opieoils.co.uk/p-73740-valvoline-vr1-racing-10w-60-premium-synthetic-engine-oil.aspx even though it seems to say synthetic-blend on the can.
Which seems to be different from Full Synthetic, as you omit word "full" here.
Generally when searched on google, most of american sources have 2 or 3 types of oil:
a) regular (read: mineral)
b) synthetic
c) and some sources include synthetic-blend which is often referred to as problematic as nobody knows what ratio of synthetic there is.
But here in Europe we have a little more and I am totally lost now. I can't find a single source explaining them all:
a) mineral oil (often called as regular oil, especially in USA)
b) Semi-synthetic, which until now was what I thought as mineral oil blended with synthetic additives etc etc
c) synthetic-blend
d) synthetic
e) premium synthetic?
f) full synthetic
What is the same and what is not? b) to e) is totally unclear now.
On a a semi-related note, after changing from Castrol Edge Sport 10w60 full synthetic to Valvoline VR1 10w60 synth-blend the pressure dropped even more (critical at idle with hot oil if I believed the gauge) Will be soon putting a manual pressure tester to see, as those dash gauges are so unreliable.
Valvoline VR1 is the same you have on your website.
Technical specifications for castrol and valvoline are attached, can this be a reason for decreased pressure with VR1 over Castrol?
Viscosity in vr1 is 23 vs 24 in castrol at 100C
and 158 vs 157 at 40C respectively, so cold VR1 is actually thicker.
Viscosity index is just as close. So I guess it should not matter?