Join Date: Sep 2002
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I was running rotella t synthetic and at 2,000 miles, it just didn't feel right. This was the third oil change using Rotella T synthetic with the other intervals at 2,500 miles and similar feelings. Remember that 5W40 means the base oil is 5W. Suzuki does not have a listing for 5W. When the vicosity modifiers shear, the oil starts to behave like a straight 5W. If you were using 10W40 then it would shear to 10W. That probably makes a big difference. How quickly and completely do the viscosity modifiers lose their effectiveness? Who knows but I think my senses tell me that it has happened to a significant extent by 2,000 miles. One would have to test the oil to know for sure.
Having seen a few engine failures on this site, I no longer want to take a chance and am now using the Mobil 4T 10W40. I am not saying that oil choice or drain interval had anything to do with the engine failures but I simply do not wish to take that chance.
As for the drain interval with the Mobil oil, I don't know. The Mobil 4T 10W40 should have the best viscosity stability of anything out there due to the type of synthetic stock oil that requires very little viscosity modifiers. I will not exceed the 4,000 mile MOM recommendation at any rate.