Can 0W30 Synthetic Oil be used in a 2000 S80T6, because the manual lists 5w30, 5W40 and 10W30 only? I live in WI and the temp can reach a high of 114F or a low of -55F with an ave high of 85F or an ave low of 28F, so I need a good quality grade of oil. I ruled 5W40 out because SAE 40 is to thick, bad gas mileage for WI weather.

I called Mobil regarding the 0W30 M1 product to find out the pour point which is not listed, the guy rudely, stated it was the same as 5W30M1; I also asked if the oil meet the European standards, no it does not. What is the difference between 0W30 & 5W30 M1?

Mobil 1 0W-30 Advanced Fuel Economy
GM 6094M, GM 4718M (Corvette spec)
Ford WSS-M2C929-A
Chrysler MS-6395
ILSAC GF-4 energy conserving
API SM/CF
ACEA A1/B1

Castrol SYNTEC 0W–30 European Formula is engineered to meet the Mercedes Benz 229.5 specification. The 0W–30 viscosity grade is ideal for winter conditions where low temperature pump ability is required. A unique, low–temperature formulation provides exceptional pump ability in cold weather and allows for unaided engine starts down to –40ºF. Exceeds all car and light truck manufacturer's warranty requirements for the protection of gasoline, diesel and turbocharged engines where API SL, SJ, SH, CF or CD is recommended. Exceeds European ACEA: A3, B3, B4; VW 502 00, 505 00, 503 01; MB 229.1, 229.3, 229.5; BMW LL–01; GM–LLA–025, GM–LL–B–025 and the engine protection requirements of ILSAC GF–3 for API Certified Gasoline Engine Oils.

Any thoughts, ideas or input on 0W30? Has anyone had a problem with 0W30 Oil?

Where can you purchase Castrol SYNTEC 0W–30 European Formula at a good price online or in WI?