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Z06 (and ZR1?) has a specially formulated 5W-50 with very low detergent levels.

It uses 5W-50

Most likely true. To be fair, we don't know the HTHS for it since it has not been published in years and the formula has had two revisions.

I'm not sure we can use a simple rule of thumb. For example, BMW have engines at 87 HP / cyl on 3.1 cP HTHS oil, but we also have older NA high revving engines with much lower power density using 5.2 HTHS for 56 HP / cyl. I agree with your overall point though.

300V doesn’t have much though, and the new version says in the PDS: “suitable for all types of fuels, gasoline, Diesel and biofuels (especially Ethanol)”

Ravenol VST or RUP, M1 ESP X4, potentially M1 FS X2 5W-50. Motul 300V 5W-40 (shorter OCI), Red Line 5W-40, etc.

Yes, Mobil 1 and other “noisy” oils don’t produce any more wear via UOA and pass the same API and OEM tests. Again, acoustic testing is easy and cheap so if it really meant anything why aren’t labs or standards using it as a method?

Even if some oils could quiet a valvetrain or sound different, there isn't any evidence that it means anything. I suspect if it did correlate with anything useful we'd have an ASTM or other standard test using it because acoustic testing is cheap. I bet molasses stops that Hemi tick for a bit 🤣.

I’ve done rinseless 100s of times on BMWs, Porsches., etc. My clearcoat was perfect and better than anyone that’s gone through even one touch car wash. It’s not a gimmick. It really is a great method with a small pump sprayer as long as the car isn’t caked in dirt. I’m never going to say it’s...

Yes it’s a shame. He does have some good insights and tests.

This guy is a clown. He thinks SL(E)S is dangerous when it's in huge concentrations in toothpaste and shampoo. Fearmongering over SDS and he does not take into account concentration. Clearly it works as a rinseless wash and I have used pretty much every rinseless on the market. You won't do any...

I hope you get it. There is no one more deserving. Castrol should have made you honorary A3/B4 0W-30 ambassador years ago 🤣. Actually, what would be fun is if HPL / LSJ would run the same test suite on it that they ran on the Mobil 1 products.

No idea what you're on about, but different oils don't make engines run smoother, and even if they did, it would not mean anything.

Noise, sure, I agree. But he said smoothness.

No one said it did. Your reading comprehension is failing you I think. In any case, engines do not run "smoother" on decent oils of similar viscosity. It is placebo. Even if it wasn't, "smoothness" is not known to be a factor directly correlated to wear according to actual engineers or SAE...

Most things I agree, but sometimes it’s nice to just grab the jug locally and not deal with more cardboard boxes.

You mean the people that think their engine runs smoother with Red Line 😂 over the only factual evidence we have which are the approvals the oil carries? I have run Red Line before too, but I'm not delusional enough to believe that a difference in smoothness could be ascertained simply by...

Mobil 1 X2 5W-50 is an LL01 pack same additive pack as 0W-40 FS. Could be a good option.

It meets the specs though, so by definition there’s nothing wrong with it even if it’s not my preferred option.

ESP X4 is a much better oil in my opinion. If I owned a Porsche I would use it over any oil that isn’t a true boutique like HPL / Motul 300V.