Hi, I have an old beat up 95 Yukon that burns oil like crazy. It also seems to be shearing the heck out (and then burning) of any non-synthetic oil I put in it. I put in 10w-40 Castrol GTX HM at my last oil change, but have been topping off with 20w-50. I tried some Bardahl's No Smoke and it worked really well for about three days before it was sheared into oblivion. I broke down and spent the cabbage on LOS. Don't judge me! I only put about 8-10 ounces in, but it seems to be working out pretty well so far, but its only been two days. We'll see if it gets sheared as quickly.
Anyway, the point of all this is: What is a good synthetic motor oil that is exceptionally shear stable, and preferably comes in some really thick grades most people would never need? I don't have money for a rebuild, and it wouldn't really be worth it on ths 189k mile beater.
The guy who had it before me knew nothing about cars, and didn't want to learn. I found four different brands and three different grades of motor oil floating around the passenger compartment when I got it. He had half a bottle of 10w-40 super tech, striaght 30 PYB, 10w-30 valvoline, and some other brand that I forget, think it may have been motorcraft 10w-30.
And when I say it burns oil, I mean baaaaad. The first oil I put in it was Castrol GTX 5w-30. It used 1 qt every 80 miles. I drive almost exactly 40 miles a day. When I switched to the GTX HM 10w-40 it slowed to 1 qt every 120miles. now it seems to be more like 1 qt every 150 miles since I started topping off with the 20w-50. Hopefully you can recommend a thicker shear stable full synthetic so I can stop using LOS.
Anyway, the point of all this is: What is a good synthetic motor oil that is exceptionally shear stable, and preferably comes in some really thick grades most people would never need? I don't have money for a rebuild, and it wouldn't really be worth it on ths 189k mile beater.
The guy who had it before me knew nothing about cars, and didn't want to learn. I found four different brands and three different grades of motor oil floating around the passenger compartment when I got it. He had half a bottle of 10w-40 super tech, striaght 30 PYB, 10w-30 valvoline, and some other brand that I forget, think it may have been motorcraft 10w-30.
And when I say it burns oil, I mean baaaaad. The first oil I put in it was Castrol GTX 5w-30. It used 1 qt every 80 miles. I drive almost exactly 40 miles a day. When I switched to the GTX HM 10w-40 it slowed to 1 qt every 120miles. now it seems to be more like 1 qt every 150 miles since I started topping off with the 20w-50. Hopefully you can recommend a thicker shear stable full synthetic so I can stop using LOS.
