What is considered too hot when it comes to oil temp in your PSRU? Most Titan owners are running syn oil. And typical operating temps for the Honda V6 are from 105-110F. For the LS3, closer to 170-180F. Note the gearbox oil also runs the prop governor, in the Titan Mustang. Reading about engine oil temp and high tuned cars, temps of 200-220F are not only acceptable, but desirable. Mobil states their syn oil can withstand temps of 500F.