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Watching Lake Speed Jr. YouTube video on Mobil 1 0W-40, I am wondering why he does not recommend it for Direct Injection engines, when my car manufacturer does who uses nothing but Mobil as a factory fill and so does Mobil.

That would apply to many on forums. Some of the advice I see on the car and motorcycle forums I am on, I can only roll my eyes. Comments on anything electrical or mechanical...

Lake is a bit too hyper for me if I happen to bump into his channel by accident. And the oil analysis he pushes, I've never needed one in any of my high mileage cars. Lake I assume got the FS meaning from Mobil. Help Desks usually held by non-techical types I do not put any faith in and that is...

Where did you read that? What site? Look I have been around the internet for a long time and there is one thing that was obvious to me, the internet is ths greatest source of unconfirmed information. And for that reason, I like to list sources. I also came from working in a lab for over 20 years.

Curiosity, because so-called experts like Lake says on thing and others on this forum say something else. Its not a use or do not use question. Critical, it isn't as it is the oil spec my car calls for.

And that is why I asked the Help Desk to get an answer from an engineer who deals with 0W-40 to get back to her. A couple of emails went back and forth. If it stands for something else, please provide manufacturer documentation.

Time to lock any oil thread or forum, if that is the case. I just use what is recommended in the Owner's Manual and have never had a problem in 50 years of vehicle ownership, yet people go to forums asking for recommendations from others that apparently know more than the manufacturer.

From the source at Mobil... Thank you for your patience. The FS on the Mobil 1 FS 0W-40 stands for " Full Synthetic ". I received confirmation this morning. I hope this helps clarify any confusion you might have. If I can help with any other motor oil questions, please respond to this email...

Yes I saw that, but then aren't all Mobil oils a Synthetic? So what exactly is a Full Synthetic. Anyway, not worried about the oil as I have never had an oil related failure in almost 50 years. Just wondered about the FS and what it stood for. I'm always skeptical about what I read on forums...

Maybe, but do you have anything from Mobil stating that. As for the rest of the comedians with their comments, real funny, but don't quit your day job. :ROFLMAO:

Just curious, so I contacted Mobil. The Help Desk got back to me with nothing informative, so I asked her to ask an engineer who is familiar with the 0W-40 I have been using. Their response: Full Synthetic. Why bother listing FS when the jug already states Advanced Synthetic... and all oils I...