Re: rotella 15-40 in an H

Posted by jonnnny2006 on May 19, 2007 at 23:35:47 from (67.142.130.17):

In Reply to: rotella 15-40 in an H posted by RMO/MN on May 19, 2007 at 21:02:40:

The first number is in how the oil will pour when it is in cold whether. the second number tells when the oil will begin to break down and fail at high temps. For example 5-30 will pour better then 15-30 in cold wheather but will offer the same heat protection as 15-30. Back in old days they used just strait 30 weight. Which in cold wheather would make the engine turn over hard as the oil would be thick. So they came out with a multi weight oil to try and get the best of both worlds. In my car i like to run synthetic 5-50. It is hard to belive that a oil can pour at the 5 weight when it is colds but also can protect up to the 50 weight rating. But that is what the rating is... I live in minnesota where it can be -20 in the winter and 3 months later it can be 80 out side. It is hard to find a oil that has a 5-50 rating and is expensive. I just use that in my cars. In my tractors i run 10-40 in the summer and befor winter i will run 5-30. If you had a seal that is going out and you put in thinner oil it only makes sence that when it is parked and left in one spot after it cools off that the thinner oil would leak faster. Warm the tractor up once and let it sit in one spot as it should leak more when warm. So it would make sence if you were running strait 30 weight before and dint notice a leak when parked it was because the strait 30 weight at the same temp will be thicker when cold and just like honey when it is cold will hardley come out of the bottle. you warm it up and it will run right out. It is normal for the old iron to leak oil here and there. I just put card board under the tractor as so i dont get it on the shop floor.

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