Mobil 1 V-twin 20w50 oil

[nmlss2006]

I know there is legislation in Europe that phases out zinc in automotive oil. I also know - or rather, the Porsche community has verified, that there is quite a difference between the 0W40 and the 5W50. Enough for it to matter in a very real sense when you're making a lot more horsepower than factory.
With all this said: Mobil 1 at $21 for a five litre jug? Where?

[JGood]

I know there is legislation in Europe that phases out zinc in automotive oil. I also know - or rather, the Porsche community has verified, that there is quite a difference between the 0W40 and the 5W50. Enough for it to matter in a very real sense when you're making a lot more horsepower than factory.
With all this said: Mobil 1 at $21 for a five litre jug? Where?

Wal-Mart

There is all kinds of legislation everywhere. It's easier to list the laws that make sense then the ones that don't.

There may be a difference between Mobil's new 5W-50 and 0w-40. And if I had a fully built Porsche race car I'd probably consider looking into it. But the lab results that have been plastered all over the internet are good enough for me. Any Mobil 1 full synthetic has a better additive package and zinc content then what any of my engines, and probably anybody on this forum, requires for a long life. We aren't running shitty SM dino oils with 100ppm zinc.

The EPA is the main conspirator behind the zinc reduction in oil. They want new cats to last 120k miles (probably not as easy without the precious metals as was used in previous years), and don't give a shit how long your engine lasts. I'll replace a cat before I replace an engine, screw the EPA.

[nmlss2006]

I was not disagreeing with you: I am just saying that the *old* 5W50 (it's been around for ages) and the current 0W40 are different and the 5W50 is heartily recommended if you happen to be one of those Porsche owners whose turbo engine puts out 600+HP. At $28,000 for a new bare block (bought carefully - list is over $42k), trust me, it's worth investigating.
With that said, that is a very different environment than an M20 engine: the only thing I've been told repeatedly is that the higher zinc content of the 15W50 specifically will help with head/camshaft wear. Other than that, it's all more than abundant.