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Originally Posted By: JXW Originally Posted By: glxpassat Look for VW 503.01 if you want the full saps version of VW504. Any brands you can suggest in 5w30 or 5w40 ? It's original spec was a 0w-30 weight. The SL version of GC met it and then they took it off the bottle because it had been...

Originally Posted By: bobbydavro VW503 01 was made obsolete years ago. Yes, because the 504 spec superseded it, which is fine in Europe but the 503.01 is a better choice in the USA since it's full saps. The latest M1 0w-40 FS gave it credence on the back of the bottle, saying something like...

Look for VW 503.01 if you want the full saps version of VW504.

I like the statement on the back "recommended for VW 503.01", which has been superseded ever since VW 504/507 came out probably 8 years ago. It was Audi's spec for extended drains in high horsepower turbo equipped motors. The 503.01 was full saps, whereas the newer VW 504 is mid or low saps, and...

Originally Posted By: Gokhan Regarding engine noise, I respect people's opinions but my conviction is that it's mostly a perception issue. Human ear isn't good at detecting small differences in sound levels -- that's why we have a decibel scale. Where I notice the difference is at high rpm...

I use the Castrol as it seems smoother.

Less consumption with 40w.

Originally Posted By: bobbydavro Originally Posted By: OVERKILL Originally Posted By: bobbydavro I can't share it. Engine has changed from the M96 normally aspirated to the M9A1 twin turbo direct injection 500hp engine. Its a very challenging test with turbo coking of oil feeds a parameter...

I bet Porsche doesn't publish the test criteria so rouge oil companies can't claim they meet or exceed the specs, which helps the companies that get the approval.

Originally Posted By: Quattro Pete Originally Posted By: Mathson As I recall it was M1 FF 100 0W-40 they use for factory fills. What exactly is that and how does it differ from regular M1 0w-40? This page has msds info on several oils including the FF 100 -...

In my VW, when revving the motor up to higher rpm's, it doesn't seem as loud and just seems smoother with the Castrol. Also, it doesn't drink the Castrol as fast as the M1.

But wouldn't it be safe to assume that the HTHS test criteria is based on the harshest expected conditions? IE, high speed/high load? Maybe it doesn't get that hot or sheer that bad when cruising at 40 mph under light throttle... If that's the case, the 40w should offer a little more protection...

The oil may get to that temp while inside a bearing or turbo, but it's not that high when it enters. A 40w is going to be thicker when it enters, so for however long it's in a bearing, it's average viscosity will be higher.

I think what's missing here is the realization that oils in an engine are rarely going to get to 150c where the HTHS spec is measured, where a 30w and 40w with the same HTHS would have equal viscosity. If the oil stays closer to 100c most of the time, the 40w is going to be thicker than the 30w...

The 0w-30 is now made in Belgium. The 0w-40 is made in Germany. Both now contain titanium. The best deal is the 5 quart jugs of 40w at WalMart for $21.

These are small and strong.

Originally Posted By: edyvw But for the U.S. market for engines that used VW 503.01 is VW 502.00 replacement spec. I haven't read that anywhere, got a link?

503.01 was replaced by 504. It was a long life high horsepower variable service oil (30,000km or 2 years). http://www.oilspecifications.org/volkswagen.php

I drive a Passat with the 2.8 and it loves the Castrol 0w-40 which is only $21 for a 5 quart jug at WM. Very smooth.

I'm surprised it meets MB 229.5 with that low of a flash point. Does anyone have a plot of noack vs flash point?