Originally Posted by oil_film_movies
Originally Posted by Smokescreen
..simple......look up what they use on that engine/car in Europe and use that.
0w-20 in Europe too.
Both Castrol's and Mobil's websites call for the Jag-spec 0w20 in this Jag.
A great choice is an MB 229.71, VW 508, Jag-spec Mobil1 ESP x1 0w20, hard to get in the U.S. though, maybe via Ebay.
Reported HTHSV = 2.6 cP and my calculations predict the actual HTHSV to be 2.55 cP.
For the Motul Specific 5122, they also predicted 2.55 cP, despite the reported value being 2.7 cP.
It looks like these new Euro 0W-20 (ACEA C5) oils are pushing the HTHSV down to 2.55 cP, which rounds off to the minimum limit of 2.6 cP so that they could increase the fuel economy as much as possible. Given that typical US 0W-20 has HTHSV = 2.7 cP, it seems that the Euro OEMs are are even more eager to increase the fuel economy than their US and Japanese counterparts. Also, 0W-16 is not available in Europe and they are stuck with HTHSV = 2.55 cP for a while.
Yes, Europe is coming from behind but 0W-20 is expected to be the most common oil in the new European cars:
"It is expected that ACEA C5 will become the baseline requirement for the next generation of OEM specifications as OEMs look to further reduce CO2 emissions. As a result of this, Lubrizol forecasts that the majority of ACEA C5 engine oils will be formulated as SAE 0W-20 and lighter with a minimum HTHS of 2.6 cP."
https://www.lubrizoladditives360.com/acea-2016-becomes-mandatory-new-formulations/
Someone pointed out that most new Audis are using 0W-20 now.