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I used Royal Purple in my Eclipes and it was great. When I did another oil change and used Moble 1, I noticed the difference in sound for the worst. The car seemed to run smoother with Royal Purple. I went to BMW and asked about Castro and was told that most people use Moble 1, BMW just has a contract with Castro that is the reason why it is recommended.
P.S.
I did ask another auto tech and he told me Royal Purple should not be used for new cars. :iono:
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Black Sapphire 135i Black Boston Leather / High Gloss Black Trim ------------------------------------------------------------------ 6-Spd. Manual, Prem. Pkg. Sports Pkg., Cold Weather Pkg, Nav., Comfort Access, PDC, Hi-Fi, iPod/USB adapter |