Engine Oil Type

[lostsole69]

the manual for my 1952 CUB says use 20 wt is 15/40 to heavy for it?

[Slim140]

Any oil is better than no oil.

It should be fine.

[inairam]

multi-weight oils were not around when the engine was designed or the manual written or updated. Many members use 15/40 oil.

[john2189]

[quote="Shane N."]Any oil is better than no oil.

Shane, that’s my line

[MiCarl]

When I first got my Cub I put in 15W40. When I changed it last fall I put in 10W30. I found that it turned easier cold but with warm weather it's smoking a bit and apparently leaking a little at the rear seal.

Next change I'll probably go back to 15W40.

[Adamshan]

I typically use rotella 15w 40 in everything I own and have yet to have any problems. If it's good enough for big diesel trucks it should be plenty good for old tractors.

[TallCoolOne58]

In the world of personal biases and opinions, factoring in operator's manual recommendations, modern availability, knowledge and experience, my personal preference for 40+ F temps is SAE 30, specifically Castrol HD30. Daybreak temps drop consistently below 40 degrees F, Castrol 5W-20, since I have 6 volt positive ground, and where I live -22 F is by no means uncommon in winter, and I need it to start for snow plowing.

Edit: Although, to be honest, I have seriously considered the Shell Rotella T5 Synthetic Blend 15W-40 on more than one occasion.

[Grizz]

For many years I have used 15-40 Delo in my Cub, H, and JD 1020, works very well and no issues.

Grizz