Do remember that Mobil one synthetic is not really synthetic anymore. After the lawsuit Mobil 1 started using a Group III base for its oil (actually a mix of group III and IV with most of it being group III)... just like what they were accusing Castrol for. A real synthetic is made from a group IV (PAO's) and is what Mobil 1 used to be. If you remember M1 used to be significantly more expensive than Castrol. Most "regular" oil or "dino juice" on the market today is mostly group II based. Castrol regular oil used to be mostly group III based until they came out with their "synthetic" branding. This is why it was one of the best oils on the market. Currently the regular Castrol is a mix of group II and III base with most of it group II. I still use Castrol because it's still one of the best regular oils on the market and I think the only one that still uses any group III base in it (I think it's less than 20%). Synthetic blends you see on the shelf are generally a 50%-50% mix of group II and III bases. If you look at a bottle of "synthetic" oil and it says "Made in Germany" than that is the good stuff. In Europe you cannot use the term "Synthetic" unless the base is almost all group IV or higher. IIRC this is the case with Castrol Edge and Castrol Syntec European formula (at least for a time). Your private label / gas station brands of oil are almost all exclusively group I and II blends. This is why brands like Redline, Royal Purple, Amsoil, etc. are so much more expensive. They are generally Group IV+ bases. Richard PS here is a good link on the groups... http://www.performanceoiltechnology.com/baseoilcategories.htm -----Original Message----- From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of Nelson, Allan Sent: Wednesday, December 16, 2009 7:52 AM To: dmcnews@xxxxxxxxxxxxxxx Subject: RE: [DML] Brake Fluid "Synthetic" is very much a marketing term for Castrol. Their "synthetic" oil is just highly refined dino oil. Mobil sued them over this a few years back and remarkably lost. There is a reason Mobil (and other legitimately synthetic oils) cost more than Castrol but the average uneducated consumer just sees the word "synthetic" and gets all excited. Al ________________________________ From: dmcnews@xxxxxxxxxxxxxxx <mailto:dmcnews%40yahoogroups.com> [mailto:dmcnews@xxxxxxxxxxxxxxx <mailto:dmcnews%40yahoogroups.com> ] On Behalf Of DarkStar Media Sent: Tuesday, December 15, 2009 2:59 PM To: dmcnews@xxxxxxxxxxxxxxx <mailto:dmcnews%40yahoogroups.com> Subject: RE: [DML] Brake Fluid Remember in the US "synthetic" is a marketing term.... it does not have to actually be man-made. In Europe that is not the case. It may still be mineral based. Richard [moderator snip] ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: dmcnews-digest@xxxxxxxxxxxxxxx dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/