Quote:
Originally Posted by JFP in PA
Simple: There was a time with M1 products were some of the best, but ever since Exxon acquired Mobil, it has been all down hill. UOA's have continued to show products like their 0W-40 going downhill, falling out of grade much sooner than the original products, loss of film strength, low TBN values after short mileage use, etc. The 0W-40 has also undergone multiple reformulations, none of which made it better; and in fact one actually caused it to totally lose its ACEA performance ratings, which it literally barely got back after yet another reformulation. Since Exxon acquired the product line, it has looked more like a product line run by accountants than engineers.
There are simply multiple better products out there, many of which show the ability to hold their performance advantages long after M1 has given it up.
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"We use Castrol Syntec 10W-40 and Joe Gibbs DT40 as our standard oils for street use."
It is now called Castrol Edge with Syntec power ? +/- Titanium- ugh Marketing people!
http://www.castrol.com/en_us/united-states/motor-oil/full-synthetic-motor-oil/castrol-edge.html
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Every time someone asks the perennial oil question ,this should be the first link/response.
A link to a current coupon/deal for either Castrol Syntec or JGDT40 would be also useful.