Last post on Jul 03, 2012 at 11:43 PM
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#8934 of 8935 Re: Now I'm scared follow up [gsleve]
Jul 03, 2012 (9:19 pm)
I was on the scene as a Mobil Oil management employee in 1975 and ran an award winning Auto service center in 1979 for Sales and Profit.-Mobil 1 at that time was a 50,000 mile oil with filter removal at 25,000 and changed plus add 1 quart.My dad bought a brand new Corvette and after breakin was done Mobil 1 was put in and at 25,000 the filter was changed and at 50,000 it was total changed.The drained oil was clean and looked almost brand new.I have 221,000 on a 1997 Ford Truck V-8 that uses Mobil 1.--A 1967 Chevrolet Caprice Classic with 54,000 and was changed over to Mobil 1--.A 2007 Ford Taurus with 80,000 uses Vavoline synthetic.--Have not been able to find out why Mobil 1 was downgraded to 15,000 miles.--Any answers?
#8935 of 8935 Re: Now I'm scared follow up [eladoj]
Jul 03, 2012 (11:43 pm)
Have you run oil analyses on the oil at change to determine whether wear metals and TBN were within tolerable limits? Those are primary factors in determining the suitability of oil.
I suspect that the 15,000 interval for M1-Extended is a safe bet by the manufacturer in lieu of analysis. In other words, one could use the oil at that interval in most vehicles and expect that were it to be analysed after 15K, it would be readily protecting the engine. Beyond that and the specific application, quality of filtering, etc., would play roles in how long it would last before protection diminished.