As much as we discuss things here many of our beliefs about oil performance are not based in reality. This has been pointed out over the years when chemists involved with formulating oils at the big companies have joined us. As such, for comparing products we're still heavily dependent on marketing material that the mfrs put out. Pennzoil used to claim that PUP produced 25% less piston deposits in the IIIG test than M1, 35% less than Synpower and 40% less than Castrol Edge.
They've since dropped the comparison to Castrol Edge which makes me wonder if Edge now performs just as well. The current Edge additive package does look almost identical to the original PU (at least what we can see on a voa). They claim PP is 8% cleaner than M1. Considering Castrol is probably the biggest competitor after M1, I can't imagine they'd drop the comparison if they could still maintain it. I'm still not a fan of Castrol's marketing or over the BP spill, so will probably switch back to PP after M1 EP, but I have some interest in their products again if this is true.
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Current:
They've since dropped the comparison to Castrol Edge which makes me wonder if Edge now performs just as well. The current Edge additive package does look almost identical to the original PU (at least what we can see on a voa). They claim PP is 8% cleaner than M1. Considering Castrol is probably the biggest competitor after M1, I can't imagine they'd drop the comparison if they could still maintain it. I'm still not a fan of Castrol's marketing or over the BP spill, so will probably switch back to PP after M1 EP, but I have some interest in their products again if this is true.
Before:
Current:
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