Oil for tuned B58?

[Jerrysends]

The QS is popular here. This is the same formulation that was the official Ferrari motor oil, known as Shell Helix in Europe. The Castrol 0w30 & M1 0w40 are other great ones, popular with those in colder climates.

 

[FlyingTexan]

S

Thread 'Synthetic Oil "Groups"'

Nov 8, 2018

For years I have used and still do, Red Line motor oil. Early on, I heard it was a "Group 5" synthetic oil. What I do not understand is what defines an oil's "group," and wither one is chemically better than another. Yes, I do understand certain properties of an oil, like HTHS, viscosity index, etc, might suggest a better quality for it over another. But for me it comes down to lubricity in all temp ranges, cleanliness, and breakdown resistance. So, can you guys explain to me these groups? (i.e.: I have heard that Mobil 1 is a Group III or IV, and much cheaper than a Group V. WHY?)

• SHAMUS
• Replies: 13
• Forum: Passenger Car Motor Oil (PCMO) - Gasoline Vehicles

https://bobistheoilguy.com/esters-in-synthetic-lubricants/

You also have review of all base oil in oil university section.

However, key is final product! 300V is ester based product, but it is racing oil. Additives might not be suitable for longer drain intervals.
Castrol Edge 0W30 in AAP and AZ is 25-50% PAO based. Current M1 0W40 doesn’t have esters, it is mix of PAO and GTL. Pennzoil and QS are GTL based.

Awesome. The Castrol Edge 0w40 seems easier to find than 0w30. How much of a HTHS difference is there? I'll try to see if I can find some locally today.

 

[edyvw]

Awesome. The Castrol Edge 0w40 seems easier to find than 0w30. How much of a HTHS difference is there? I'll try to see if I can find some locally today.

0W30 will be 3.5 or bit above. Castrol 0W40 will be 3.7.
They are same family of oils. 0W30 being more shear stable with lower Noack.