15W40 engine oil use

Just a quick note to enquire what you all use in your respective machine. Reason I am asking is I have a mixture of gas and diesel engined machines and was thinking of using just the one oil in all of them.
Two tractors - one gas and one diesel. Rider mower and snow blower both gas.

To make it easy I was wondering about using just the one oil for all machines. 15W40 summer and maybe 0W30 for winter - opinions please. Where I live it gets to -35C on winter and up to +35C summer.

Thx

J.

Thanks for all of your replies. Seems the general concensus is that sticking to the one oil will work - which is what I thought. It will certainly make things a lot easier all around and I won't need to be concerned about mixing oils/brands.

I am in central BC, Canada and just about a month ago had a week of -35C temperatures. Not nromally that cold, but it does happen now and then. When it is that cold I don't go outside unless I absolutely have too :-)

Thanks again for your comments.

J.

I too have several tractors and I tried using 15W40 in my TO-30 because that"s what I use in my Ford 4610. It made it more difficult to start so I went back to 10W40 year round in the Ferguson. I beginning to think that I need to go to 10W30 or 10W40in my Ford because it"s really hard start in below 5F. Ford recommends 10W30 SAE grade below 0C down to -25C. They don"t have a recomendation for below 25C.

I feed big round bales so if the tractor doesn"t start, the cows don"t eat or I have to pitch hay into the pick up to feed "em!
if you have consistent weather at or below -35C, then perhaps 5W30 might be a better choice for you. You might do some esach on the web and/or get a recommendation from your nearest dealer.

Rotella T Synthetic 5W-40 (CI-4) would be a good cold weather choice for all 2006 and earlier models diesel engine pick-ups.

Link

2007 and newer models that have a diesel particulate filter require a CJ-4 rated oil. We plan on introducing Rotella T Synthetic 5W-4 (CJ-4) in April or May. A CJ-4 oil is backwards compatible with CI-4 and earlier categories. Do not use a CI-4 rated oil in a 2007 and newer model that have a diesel particulate filter.

The second number in the multigrade designation is based on a viscosity at 212F. To be a SAE 40 weight the oil must have a viscosity between 12.5 and 16.2 centistokes at 212F. At 212 F a straight 40, a 15W-40 and a 5W-40 are all in the 12.5 to 16.2 viscosity range. Therefore, a 5W-40 is not a thinner oil at operating temperatures (approximately 212F). However, when you cool the oils the straight 40 will thicken the most, and the 5W-40 will thicken the least. This makes Rotella T Synthetic 5W-40 a good year round oil in both hot and cold weather.

I forgot to mention that the two vehicles I have (pickups) are both diesel and so is the JD450 I own.

The MF-65 tractor I have is a gas engined one.

So using just the one oil would help make things easier all around.

Thx.

J.