Oil Weight

The old manuals will say 30wt, but I have been running 15w40 for years without a problem. My only caveat is that I don't use the tractor in the winter.

1951 B

They probably used the 15w40 because it was STANDARD with the larger Diesel tractors on their farm.... Thats fine, but normally 10w 30 would be your choice.

Like them all, but love the "B"s.

If I were planning to work my Model C hard in the summer I would run 15W-40, however, I don't ever work it hard so I run 10W-30 and if I were using it in the winter I would use 5W-30

O GOODIE, AN OIL THREAD!!🎉🎉 I’ll get some popcorn.

I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.

Ed (Ont) wrote:

What brand of popcorn? What oil did you use on it? Smile

Definitely butter. Any brand of popcorn that floats your boat.

I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.

Thank you guys for all the answers!

Just like "condenser" rather than capacitor of which it really is. So many years have transpired it's part of the jargon. Same thing with "Band-Aid".

For many years we ran straight SAE 20W oil in the colder months, and SAE 30W in the warmer months. Straight 30W oil in the Detroit Diesels all year round with engine preheaters installed.

Still have a barrel of each in the shop.

Edited by Codger - 27 Dec 2023 at 9:41am

A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now.

Oil viscosity has always been referred to as WEIGHT... Google "20 weight oil" and you will get PAGES of hits.... If you have ONE NUMBER like 20W , 30W, 50W ... that is called 50 WEIGHT oil and has a viscosity THICKER than 40w or 30w.. ...

If you have TWO numbers like 10W 30 ..(multi- viscosity)... the W is the WINTER RATING (10 weight) and the second number is the SUMMER RATING ( 30 wt) ................ In reality it is VISCOSITY, but has been called WEIGHT for a hundred years.

and referring to it as "50 weight" is a lot easier to remember than " 210 centistokes @40 degree C".. Wink

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Internet..............When it comes to determining and choosing an oil weight, none of it involves weight as we commonly think of it—there are no weight scales involved in weighing oil. Instead, in this circumstance, weight refers to the oil's viscosity, which is a fluid's resistance to flow. Generally speaking, the higher the viscosity, the slower it'll flow, the lower the viscosity, the faster it'll flow.

Oil weight is a critical detail of keeping your engine running as efficiently and reliably as possible, and the way it's identified is a mixture of two rating variables. Let's dive into what those two variables are, why they're important, and why someone might consider deviating from their car's recommended rating for their next oil change.

Edited by steve(ill) - 27 Dec 2023 at 9:44pm

Like them all, but love the "B"s.

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