shell rotella t6 5w 40
 

Shell rotella t6 5w 40 full synthetic has any one used this oil in there boxster?I just changed oil in mine and used this, it has a api service rating cj -6 and a sm rating so it should be fine for the boxster right ?

Most questions on oil lead to arguements and dissertations.

If it matters to you, Rotella is not on Porsche's latest approved oil list.

I think the Euro standards ACEA are more important than the API ratings.

If the Rotella oil has ACEA A3/B3/B4 specs it "should" be OK, but it also depends on how you drive your car and how often you change the oil / filter.

I have used Shell Helix Ultra synthetic (5W40, A3/B3/B4) oil in my Boxster S - and Shell motorcycle oils in my bikes too - for years with great results. They make a good product but I don't know how available Shell products are in North America.