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billybronco1 · 11-28-2020, 02:22 PM

So after reading about the controversial subject "what weight of oil to use" I decided to do my own experiment. Seems its a toss up between 10W-30 and 20W-50. Not sure the consensuses on full synthetic.

When I bought my car a few months ago I changed the oil, used the same as the previous owner 10W-30 full synthetic. I really didn't like the sound of the engine, light lifter noise, more noise under a load, oil pressure was about 25 psi cold and about 10 psi hot at idle.

So the other day I changed it to 10W-40 still full synthetic high mileage and a can of STP (another controversial item) results are 30+psi oil pressure when cold and 20 psi when hot. As far as the noise once the car was hot it was much quieter and ticking under a load was almost completely gone.

Part of the problem with this car is the previous owner ran it for years with no thermostats and it never got hot, at least I could not get it above 130 degrees. Now with new thermostats installed she is running between 180-200 degrees so the oil should work better.

I might consider 20W-50 in the spring. What weight/kind of oil do you use?

11-28-2020, 02:22 PM	#1
billybronco1 Senior Member Join Date: Dec 2012 Location: MA Posts: 570	Changed The Weight Of My Oil So after reading about the controversial subject "what weight of oil to use" I decided to do my own experiment. Seems its a toss up between 10W-30 and 20W-50. Not sure the consensuses on full synthetic. When I bought my car a few months ago I changed the oil, used the same as the previous owner 10W-30 full synthetic. I really didn't like the sound of the engine, light lifter noise, more noise under a load, oil pressure was about 25 psi cold and about 10 psi hot at idle. So the other day I changed it to 10W-40 still full synthetic high mileage and a can of STP (another controversial item) results are 30+psi oil pressure when cold and 20 psi when hot. As far as the noise once the car was hot it was much quieter and ticking under a load was almost completely gone. Part of the problem with this car is the previous owner ran it for years with no thermostats and it never got hot, at least I could not get it above 130 degrees. Now with new thermostats installed she is running between 180-200 degrees so the oil should work better. I might consider 20W-50 in the spring. What weight/kind of oil do you use?