5w30 is a little thinner, so its better in cold weather for starting up.I use Mobil 1, but I use 10w-30... I'll be using 5w on my 2nd upcoming oil change (i already got 6 quarts on sale of 10w-30. LOL) Manual says 10w is recommended. Any reason why everyones usin 5w? Cold weather areas?
I use Mobil 1, but I use 10w-30... I'll be using 5w on my 2nd upcoming oil change (i already got 6 quarts on sale of 10w-30. LOL) Manual says 10w is recommended. Any reason why everyones usin 5w? Cold weather areas?
Where did anyone say Mobil 1 was the best? They simply said it was recommended, so thats what they use. Also, show me a 1st gen CTS with the DI engine. I still dont believe that the timing chain problems are oil related. There are too many cars with the HFV6 with 2 and 3000 miles on them, with normal oil levels and yet they still have the timing chain issue. If it was a n oil related issue, I dont think it would show up often on brand new cars with proper oil levels. This is the N* issue all over again. It might be 10 years before GM finally figures out whats causing the issue.If you think Mobil 1 is the best oil for the 3.6 L engine in the CTS you'd better think again. The 3.6, especially in its DI version, has been proven to be especially hard on oil and the UOA for Mobil 1 has been way less than stellar.
We also have a 2008 Buick Enclave with the newer version (NOT DI) 3.6 and there's been a ton of information posted on Enclaveforum.net. Pennzoil Platinum, Pennzoil Ultra, and Castrol Edge have all shown good UOA results with the 3.6 DI engine. I'm using either Pennzoil Platinum or Ultra since it's available at Walmart and is a little cheaper than Castrol Edge. Pennzoil Platinum has also been certified to the new GM Dexos oil specification that must be used in all 2011 GM engines.