Originally Posted By: Dominik
FrankN4,
What engine do you use it in?? And what engines did you use it before?
'Cause I am really tempted to use my 3 liters of red cap 15W50 along with one lasr litre of 5w30 (SL squareish bottles) in my 2003 Acura CL-S with 92,000 miles on it.
I do not, have not, and will not recommend anyone use an oil not specified/recommended by the manufacturer for their engines.
From a previous thread:
Quote:
Originally Posted By: FrankN4
Straight 40 grade from 1960 to 1968. 20W-50 from 1968 to 1988. 5W-50 from 1988 to 1990. 15W-50 from 1990 to date. Used this in everything, even Chrysler and Ford that specked 5W-20. Many if not all since 1990 specked 5W or 10w30. Never an engine problem of any kind, no noise, no seep, no leak, always better than EPA estimate mileage. I have 300,000+ miles on one daily use Toyota truck, 208,000+ on a daily use Chevrolet Cavalier. Average vehicle mileage since 1990 has been close to 170,000 at trade in.
I don't understand how 15w50 gets you better than average gas mileage? And performance in cold weather? If it works out, then all the power to you..
My 2008 Slverado estimates 19 highway. Running to my daughter's house is 456 to 476 miles one way , depending on route, and I average 23 MPG. It now has 4858 miles on it.
My 1999 Cavalier specks 26-28 highway. When we take it on the same trip we average 32.
I think the most impressive was my youngest daughter's college car, a 2000 KIA Rio. It specked something like 30-32 highway. On a trip from Radford, VA to Cedar Key, Florida, and return, it averaged just over 40 MPG.
I do not know why a thicker oil like the Mobil 1 15W-50 I have used since 1990 gives great mileage, no mechanical problems, no ticks, slaps, no engine noise of any kind, engines running strong at 300,000 miles, 208,000 miles, and 170,000 to 190,000 mile range. Whether the vehicle called for 20 or 30 grade, it got 50. I think it is because the 15W-50 synthetic is thin enough at low temp to pump extremely easy/quickly, and at the same time thick enough at temperature, to lubricate with no aspheric contact to speak of, cushion, and seal. That is also where the great gas mileage comes from. I have seen evidence of gas mileage increasing up to the 25,000 mile range which indicates to me that break in is delayed, which means wear is delayed.
Why it works I do not care. That it works I have 2,000,000 miles to prove that it does work. As long as it is available, that is what I will use.
I also note that the crank bearings/min bearings, rod bearings, and piston to wall clearances are the same on my 2008 engine as they were on the 1994 engine, according to shop manuals.
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Actually, I never was as good as I used to be.
