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I'm constantly amazed at the amount and variety of opinions that are expressed whenever oils and lubrication are brought up. I used Mobile 1 in my Ford Crown Vic Police Interceptor (which I sold to buy my PV544) mostly because of the high operating temps and the high speed driving that car was subject to.
As an added bonus, I also picked up 3mpg using Mobile 1. All around, a win-win situation!
My 544 has a B20 and automatic with over 100,000 miles since overhaul. In 6,000 miles of driving, it burned or leaked 1 quart of oil. Normally I'd have changed oil at 3,000 miles, but frankly I just got too busy with my Dad's health issues to take the time. Even so, at 6,000 miles the old oil was still clear, looking pretty much like it just came out of the bottle.
Having removed the rocker cover to adjust the valves, the inside of the engine appears to be especially clean, also. According to the hundreds of receipts that came with the car, the previous owner was a fanatic about maintenance up until a few months before she sold me the car.
Our weather out here in the desert doesn't call for low-viscoity oil, so I put in 10-30 Valvoline, which is a little thicker than the 5-20 the previous owner used. Depending on the season, I may go to 10-40 for summer, since it gets into the 120's fairly frequently, and I like to drive through Death Valley on my way to Las Vegas. :-)
I don't see much indication that the engine is burning oil; the tailpipe residue is medium-gray, and there's no smoke on cold startup. The engine does leak a few drops when parked, and I haven't found the source of that yet.
When I've had time to give the engine a thorough going-over, checking the valve height, etc. and I'm sure it doesn' need tearing down in the near future, I'll be changing over to Mobile 1 with the sure knowledge that it will serve me better, and cost less in the long run, that fossil oils.
Just my 2 cents worth!
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