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Originally Posted by KSC
Yeah, I had a feeling it would be tough getting a hold of the SM, but I saw someone over at BITOG score some in late January, so I figured I'd give it a go.
No big deal. I'll end up either going with the Mazda w/ Moly of if I'm feeling particularly snobby, Sustina.
I wonder why the Idemitsu Mazda blend is loaded with Moly, though? That's SN/GF-5, so obviously the high presense of Molt doesn't necessarily reflect its compliance to the new guidelines. Did Subaru request the change themselves? What reason would they want their SN stuff to have zero Moly when it was loaded before?
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In an email someone shared with me from Idemitsu (see below), they said that they were removing moly to meet
GF5 standards . I believe that moly causes more ash. Kind of ironic since they now make a high moly Mazda oil like you mentioned.
I know the new trimer moly that is being used allows much lower levels of moly in order to achieve the same benefit in regards to friction modification.
http://www.infineum.com/Documents/Cr...ogy%202009.pdf
But the Mazda stuff has old fashioned levels of moly. I guess they came up with a way to make it work.
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You ask some very good questions which I will answer in “generalities”. First, just so you know where the information is coming from, Idemitsu supplies most of the OEM’s for both Factory fill and service fill. In the case of Toyota, we do not supply their service fill oil so I cannot comment on that particular formulation.
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OEMs specify Moly in their factory fill formulations to increase fuel economy during the initial period. In general a factory fill formula will be more robust in the additive treatments etc. This is done for a variety of reasons which I will not go into here.
Some of the service fill formulations also contained molybdenum however, with the transition to the ILSAC GF-5 specification, most 0W-20 service fill 0W-20 formulations now do not have Moly. That being said, you are always safest following the OEMs recommendations. All service fill OE formulas that we supply have been submitted to a full battery of tests at that respective OEM’s R&D facilities in Japan and have been approved.
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-Dennis