Hey gang,
I hope this is the right forum. Sure, this is a tractor and not a "Diesel/Gas Pickups/Trucks/Vans" but certainly, it's about HDEO.
I've got a 1970's era Yanmar YM1700 tractor. It's got a 20HP water-cooled twin cylinder diesel engine and the manual has some really odd recommendations for oil viscosity. Or maybe I should say that I've never seen anything like it. Below is a chart I duplicated from the operator's manual:
Conventional wisdom on these tractors is to use 15W-40, like Rotella T, and be happy. In the past I've run Rotella T Synthetic 5W-40.
Looking at my viscosity spreadsheet, at 100 deg C, most SAE 30 oils are between 10.9 and 11.5 cSt viscosity. Rotella T Syn is 15.5. So it seems that Rotella T Syn is a little thicker at operating temp than typical SAE 30's.
Interestingly, 10W-30's have a low of 10 (M1) to around 10.5 (Valvo Synpower). This tends to corroborate other conventional wisdom that says that if you can't find SAE 30, that you can toss 10W-30 into the lawn mower and she'll be happy.
So, y'all think Rotella T Syn is this a good choice even though its thicker at temp than the called-for SAE 30? Or should I put in SAE 30?
I find it interesting that the multi-grade 10W30 is only suggested for such cold temps, yet has a very similar hot viscosity!!!
THANKS,
ben
I hope this is the right forum. Sure, this is a tractor and not a "Diesel/Gas Pickups/Trucks/Vans" but certainly, it's about HDEO.
I've got a 1970's era Yanmar YM1700 tractor. It's got a 20HP water-cooled twin cylinder diesel engine and the manual has some really odd recommendations for oil viscosity. Or maybe I should say that I've never seen anything like it. Below is a chart I duplicated from the operator's manual:
Conventional wisdom on these tractors is to use 15W-40, like Rotella T, and be happy. In the past I've run Rotella T Synthetic 5W-40.
Looking at my viscosity spreadsheet, at 100 deg C, most SAE 30 oils are between 10.9 and 11.5 cSt viscosity. Rotella T Syn is 15.5. So it seems that Rotella T Syn is a little thicker at operating temp than typical SAE 30's.
Interestingly, 10W-30's have a low of 10 (M1) to around 10.5 (Valvo Synpower). This tends to corroborate other conventional wisdom that says that if you can't find SAE 30, that you can toss 10W-30 into the lawn mower and she'll be happy.
So, y'all think Rotella T Syn is this a good choice even though its thicker at temp than the called-for SAE 30? Or should I put in SAE 30?
I find it interesting that the multi-grade 10W30 is only suggested for such cold temps, yet has a very similar hot viscosity!!!
THANKS,
ben