Just the Professional series (Black bottle).
Porsche GT3 /RS A40 Oil
- Thread starter Indyxc
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That is is kind of my thinking. Looking at a lot of oil analysis's it looks like all the Mobil Euro oils shear down well below their range during usage. The 5W50 ends up like a 40, and the 5w40, ends up like a 30, and so on.
Attached is a Porsche owner who used Mobil 1 5w50, 0w40, and Motul 5w40.
One interesting oil I found lookimg later is the Mobil 1 5W50 Supercar.
https://www.mobil.com/en/lubricants.../our-products/products/mobil-1-supercar-5w-50
According this forum, and mobil is it's Mobil 1 5w50 X2 with more ZDDP for anti wear.
Thoughts on the Mobil 1 Supercar?
https://bobistheoilguy.com/forums/threads/mobil-1-supercar-5w50-pds.361626/
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Motul Sport Ester/300v arent questionable at all. Im assuming HPL has good products, but 300v is the standard in Europe for track oils.
Some oils will shear slightly and then regain viscosity via oxidation at the end of the OCI (ex, 10k miles). This leads people to incorrectly assume that an oil shears when they change it early. I imagine Porsche owners have twice the anxiety as BMW owners and change their oil at too short of an interval because they're scared to death of engine failure. They see some shear and freak out.
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OVERKILL
$100 Site Donor 2021
And a proper handle on fuel dilution, which is the primary driver of viscosity loss and not properly represented on Blackstone UOA's.
HPL has excellent products for track use.
edyvw
$50 site donor 2025
There are some UOA of 0W40 300V, which had less oxidative thickening than Mobil1 0W40.
300V compared to M1 5W50 has much lower KV100 (13.5cst) but HTHS is very close to M1 at 4.1cP. Personally, I would go 300V if out of warranty. It is standard among Porsche owners who track vehicles.
Another oil you might consider is HPL. We have a ton of evidence here that it is extremely shear stable. Do not forget, you want high HTHS and grade retention, NOT high KV100 at the start that will shear fast!
300V compared to M1 5W50 has much lower KV100 (13.5cst) but HTHS is very close to M1 at 4.1cP. Personally, I would go 300V if out of warranty. It is standard among Porsche owners who track vehicles.
Another oil you might consider is HPL. We have a ton of evidence here that it is extremely shear stable. Do not forget, you want high HTHS and grade retention, NOT high KV100 at the start that will shear fast!
edyvw
$50 site donor 2025
In that analysis 0W40 did shear down, but not as much as 5W50 % wise.
This 100%. That's why I use the HPL Euro 5/40 - the Star VIIs are showing lower vis. drop than any oil I've used including M1 0 and 5W40.
Guys like the Redline 0w40 because it gets up to temp a little faster and still has a HTHS of 4
If so it’s because of the high HT/HS that it heats up faster. Thicker oils heat up faster than thinner ones.
They do, but depending on the motor and the sump, the thinner oils come up to temp faster because they come into contact with hotter surfaces faster that thicker oils. Ive seen this alot on different race cars with large sumps
edyvw
$50 site donor 2025
You lost me. RL 0W40 is everything but thin.
I really like Redline 0w40 and 0w50. Here is a oil analysis I found from someone using it in a BMW.
I bought the Mobil 1 5W50 X2 FS, but can always return it.
The Redline Zinc and Phorporus of the 0w50 and 0w50 are really nice. It's price is also very reasonable and easy to get.
Debating return the Mobil 1 and going with this. Says sutable, aka not officially approved by Porsche.
Which is better?
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edyvw
$50 site donor 2025
It is hard to say in this category which is better. Redline will be more in 300V category except Motul doesn’t play that “suitable for” game. M1 5W50 is street oil. If you track just occasionally to blow off some steam, street oils are generally better although in some vehicles racing pils might prove as a winner. New Motul 300V has more PAO and less ester to make it more suitable for those that use vehicle as street and track car. Redline is kind of that way.
That UOA on M2 is good. Personally, I would try all and do UOA and see trends.
OVERKILL
$100 Site Donor 2021
There's no restriction on phosphorous for A3/B4 LL-01 229.5 502/504 A40 oils. Ergo, Mobil could put 2,000ppm of phosphorous in there if they felt so inclined. They don't, none of the full-SAPS oils have a gazillion PPM of phosphorous because it's not beneficial after a certain point. Just putting in "MOAR!!!!!" of a component doesn't make an oil better, that's why they are fully formulated products, where testing is performed to ascertain the proper balance that provides optimal performance.
The Redline white bottle products are, or, were historically, very "old school" in their formulation, just having higher concentrations of the popular metallic additives while claiming to have some volume of ester in the base oil blend. It's not a bad approach, but it's not necessarily better either.
The supercar is the C8 Z06 oil. It’s probably based off the ESP additive pack originally despite the ZDDP levels, not the FS additive pack like the X2. Is it a better oil? Maybe. It doesn’t have Porsche or any other Euro approvals so you would be placing some faith in Dexos R. It’s probably a better oil but we really don’t know if it would pass every A40 test. If you’re going to go away from approved oils I tend to think 300V is a better choice than another Mobil street oil specified for a different engine. I’m guessing it’s a great oil but you would be the guinea pig here for sure.
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