Dell (WA) said: (quoted from post at 12:48:55 07/16/09) Jennie.......in 1939, yer N-Engine was spec'd for 30wt oil and were told to add a pint of kerosene in winter time, and 40wt for HOT summertime plowing. Todays modern multi-weight oil is so much better.
I use 20w-50 in my eazy starting 6-volt 52-8N. Remember, its the first number that specifies the weight of the oil (20) That is why I don't like 10w-30 as it is TOO THIN for todays hot weather, and it might be too thin even in the winter time.
Ford also recommended changing oil every 100hrs or once a year in fall. Remember, oil not only lubricates but also cools. ......Dell, who knows how to read and understands oil specifications
Not even close. The first number in a multigrade oil is it's cold weather viscosity grade. The second number is it's operating temperature viscosity grade.They are at best only remotely related and are used for two entirely different purposes.
A SAE 0W30, SAE 5W30, SAE 10W30 and a SAE 30 graded oil all have the same viscosity at both 100C and 150C. How do you think an oil gets graded - by throwing darts at the chart? They take a sample of the oil to a laboratory, heat it to the specified temperatures, and measure it's viscosities at those temperatures. Don't matter if its a mono-grade or multi - grade - they are all tested at the same temperatures, using the same test methods, and all must have the same viscosities.
As far as viscosity grades go the SAE and/or API don't give a F what the base stock is, what additive packages are used, or any of that horse crap. The only thing they care about is measured viscosity because that's the only thing that matters to your motor.
Simple ehhh.
TOH
PS> A SAE 5W30 thins out MUCH SLOWER than an SAE 30. An SAE 30 starts out thicker (it FAILS the 5W cold weather test). The SAE 5W30 starts out thinner(it PASSES the 5W cold weather test). But as they heat up the the SAE 30 thins out much faster than the SAE 5W30. At 100C they both have thinned to the same viscosity - SAE 30.
This post was edited by TheOldHokie at 11:13:40 07/16/09 2 times.
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