Originally Posted By: dakota99
Actually if you were to drain your oil when it was at operating temperature (which most of us never do) it would appear to be very watery. At 100C, (212F) platinum is 10.3 cst, which to the human feel is very thin. Water at room temperature (22C / 71F) has a cst rating of 1. Ethylene glycol @ 70F has a viscosity of 17.8, so think about how undiluted coolant feels, motor oil is even thinner when heated to near operating temperature. Most of us drive our cars or trucks to warm them up before we change the oil, when in reality we never get the actual oil anywhere near 212F. Did you drain the oil after a long trip? (More than 10 miles)
SAE 30 motor oils have a viscosity range of 9.6-12.9 @ 100C / 212F.
This.
When I have drained diesel mowers at work with 10-30 while they were at op temp, the oil practically fell out. It "seemed" way thin. We drain at 50-100 hours (due to Toro's tendency to put air intakes in the dustiest locations) so I don't think it had a chance to shear.
Actually if you were to drain your oil when it was at operating temperature (which most of us never do) it would appear to be very watery. At 100C, (212F) platinum is 10.3 cst, which to the human feel is very thin. Water at room temperature (22C / 71F) has a cst rating of 1. Ethylene glycol @ 70F has a viscosity of 17.8, so think about how undiluted coolant feels, motor oil is even thinner when heated to near operating temperature. Most of us drive our cars or trucks to warm them up before we change the oil, when in reality we never get the actual oil anywhere near 212F. Did you drain the oil after a long trip? (More than 10 miles)
SAE 30 motor oils have a viscosity range of 9.6-12.9 @ 100C / 212F.
This.
When I have drained diesel mowers at work with 10-30 while they were at op temp, the oil practically fell out. It "seemed" way thin. We drain at 50-100 hours (due to Toro's tendency to put air intakes in the dustiest locations) so I don't think it had a chance to shear.
