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Great question, Mobil 1 states on the container FULLY SYNTHETIC FORMULA. That makes both of us right. But that should not be your question, if you are driving across the country and you need a quart of oil, you can buy Mobil 1 anywhere. They also sell a blend, that you can put in your engine, in a pinch. Keep in mind that the rule for a synthetic, do not put in a new engine /'vehicle until the engine seats. My recommendation, at least 10,000 to 15,000 miles. Then you need to stick with symthetic, it is not recommend that you switch back and forth. What are the basic benefits, longer time between oil changes, but the product costs more. The engine runs cooler, slightly better MPG if you stay with the lower weights of oil - 5/30 and 10/30. If you are curious what I do, I run Mobil 1 in the race trucks and all the chase trucks carry the synthetic blend. The guys are told to use what they need, the blend can be put in their truck or the race truck. When I switched to synthetics years ago and have not had a engine failure yet. When you are running the Baja 1000 it is serious business. Any thing that you can do to prevent a failure you do, this is one. Good luck.

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You can switch to synthetic oil anytime you want or switch back and forth between them - waiting 10,000 miles before using it to avoid leaks is a myth. The only exception I can think of off-hand is a new Honda - they want you to keep the original factory fill of oil in until the oil life light goes off (usually 5,000 to 7,500 miles).

If you are an oil hobbyist and you are really serious about your oil, invest in an oil analysis. I think anything else is just advertising hype or guesswork.

There's lots more opinions in these CarSpace discussions:

Synthetic motor oil

Engine Oil - A slippery subject Part 2

Source: http://www.askpatty.com/page.php?ID=1172...

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sounds like the only synthetic oil that belle tire sells is amsoil,,,,ask them if they are familiar with castrol syntec ?

And royal purple


And klotz

And probally a whole lot others iv'e never even heard of.

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Get the Amsoil and pay the $80. Amsoil is excellent and the price is reasonable. Don't worry about what they told you, as even 90% synthetic is still a very good oil. I've used them all and have never noticed a difference.

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Amsoil is the oldest synthetic oil company and they make great products. Consider them for all lubricants. As for extended drain intervals...not for the New Beetle. Amsoil sells a European formula for the New Beetle; however, the drain interval is the same (5,000) no mater what you use. New Beetles roll off the line with synthetic oil in them (Castrol). The oil filler cap has the brand Castrol written on it. The dealer will push Castrol synthetic if you get an oil change there and it runs about $70 - $80. If you choose to change your oil yourself, you can get a discount price for the Amsoil European formula by paying an annual or multi-year fee to be a Preferred Customer. I've used Amsoil for all my cars for the last 15 years. They are the only oil company that will provide you with a written guarantee for their products...no other company will do this.
I have a 2000 Buick LeSabre with 140K miles and a Chevy Silverado with 104K. Always used the extended drain interval oils and only change oil every 25,000 (filter change and top off at 12,500 or 6 months). When you do the math, it is the least expensive way to go and you are providing the very best lubrication available. Google 'Motor Oil Bible' and check it out.
Mark

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http://www.amsoil.com/company.aspx

"the first can of AMSOIL 10W-40 appeared on the market in 1972"

http://klotzlube.com/about.asp

"Since 1959"

Not saying Amsoil is bad, but there seems to be too much biased information.

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