slant 6 oil weight

roccodart440 said

I never said he needed lightweight oil.
I never said he needed synthetic oil.


I said to use the weight oil that provides the pressure he needs.
I said that I use synthetic in everything I own and that Mobil 1 is my choice.
I said do not play chemist. Buy an oil with the proper lubricating properties.


:violent2:

Click to expand...

Be careful using oil pressure to select the appropriate oil viscosity. Keep in mind that viscosity is by definition a liquid's resistance to flow (the weight of motor oil is about 1.7 lb/qt regardless of viscosity), and the oil pressure is measured upstream of all points of demand. So your oil pressure gauge might just be telling you how well the oil isn't doing it's job. An engine with clogged passages could have excellent oil pressure but lubricate poorly. If an engine will not maintain specified pressure with the recommended viscosity the clearances are way out of limits. Thick oil is not a rebuild in a can.

10w30 would be perfectly appropriate for a slant. 10w40 would be fine too, especially in warm weather. Synthetic oil IS better, but probably not necessary. Any name brand today is superior to what was available in the late 50's when the engine was designed