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Example hot visco. Anyway it's difficult to say because TOP Fiat specs are so opaque and limited to Petronas/Shell.

It can't be A3/B4 and C3. VST GH2 "recommendation" must be error because funny mixes between Fiat and Chrysler. Chrysler are 5w40 and 0w40 ~ Z2/H2 (A3/B4 high performance), so VST is compatible, but never GH2. In worst case you can go from A3/B4 to C3, but never the opposite (oficially).

X-Clean and VMO use same additive pkg from Shell, both mainly G.III, I'd use cheaper. Quadrifoglio seems Lubrizol pkg and little secret there until analized, it's Sport Power sucessor, should be like others or little better. Other good options, GH2 apart, are Aral High Tronic, Havoline Ultra S...

X-Clean gen2 lost A40 and GH2. It has different bases chemistry, incredible VI, HTHS and cold performance but change hot visco and flash point, may be the reason.

Mainly seems G-III yes, but it has special flash point and good pour point, so seems it has any extra neutral base oil (Etro+ from Petronas or C15-50 from Mobil/Neste) or little PAO.

I mean GH2 is like H2 but C3.

S2 is 5w40 C3 not high performance. T2 is 5w40 C3 for GAS (C3 with lower SAPS) Z2 is 5w40 A3/B4 ~ MB229.5 high performance (premium M2/N2)

Not public, it's part of Petronas-FCA contract. Anyway any stable w40 will work same or better.

Yes. H2 is M2 5w40 A3/B4 for high performance engines (high visco too).

5w40 C3 high visco (15cst). It's H2 + C3.

Smith and Napa seems similar base oil and additive. Obviously they are remarked oils from other main producer. Mannol is little ticker because different chemistry or worst quality. Mannol usually is low-range oil.

Very intelligent moves, you can have very cheap and powerfull laptop for things like OBD or everything. Anyway from my POV, if not absolutly required, I'd not use Win10, it's a waste of space and specially resources, 7 SP1/SP2 and 8.1 are lighweight and faster (8.1 boots like lighting and...

Your gearbox is 510 design, 514.6, it's from old times 80w90 GL3 and after GL4/+/5, so not problem. Fiat changed oil specs many times, today is 75w85 GL4 and GL4+ for most C5xx designs, GL5 was discarded.

Yes, but it will not be very friendly when cold.

From my European B4 need, for short mileage+long time runs it's could be interesting vs FS. Pros: seems it stays in grade easier than FS (even if it's not an issue for FS with increible performance), little higher HTHS/VI and little more clean for internals/exhaust Contras: FS supports really...

# Is "EP oil" just the same as"hypoid oil"? No, there are EP oils not suitable for hypoids gears. EP is an oil propertie necessary for specific systems. Hypoid is a gear contact that usually requires high EP properties (but there are hypoid gears to work with medium or low EP like GL4+, GL4...

I see that and raise to "than Meguin Megol light years away" Ravenol have good oils, but like Castrol, over priced sometimes, over marketing other.

Oh yes of course, so M1 5w30 and 0w40 performs very good price/quality. How much does RL 5w30 cost there? Here RL and Amsoil 60-80$ 4L.

For me lower wear was with RL 5w30. If you repeat 2 RL uao 8k miles with this labo you could confirm it.

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