i'm going on my 4th oil change on my '03 6.6 . at the auto store is 2 different shell oils . rimula and rotella t . can someone please tell me what the difference is? it's 15w40 the first oil change i did , i used the rimula and it's seemed ok. i did the first oil change at 5,550 miles and i'd like to do it that way all the time. the second oil change i did , i used rotella . i got this really nasty smell ! dam it stinks and i noticed the engine had used some oil while using the rotella and not with the rimula. i'm new to the diesel world so any help would be great , thanks ,ron :ro)

Well here's what I found on the shell web site.

http://www.shell.com/home/Framework?siteId=lubricants&FC2=/lubricants/html/iwgen/shell_for_businesses/transport/products_services/zzz_lhn.html&FC3=/global/shell_for_businesses/oils_lubricants/rimula/rimula_productrange/rimula_super_ga_0105.html

Sorry the link is so long, I don't have that tiny url thing down yet.

If you snoop around the shell lubricant page, I think you might find a difference but I didn't.

On Shell's website Rotella T and Rotella T Synthetic Blend are the only ones claiming to meet service and warranty requirements. Rimula appears to be for heavier duty (and slower turning) engines.

Thanks For All Of Your Help Guys , Ron