My first new truck was a 1980 Toyota with the 20R or 22R motor (Can't recall).
I ran Esso XD-3 15W-40 in summer and Esso XD-3 "Arctic" 0W-30 in winter, same as my heavy equipment.
In 1984 I got a new Ford pickup with 302 V8. It ran Delvac 1, same as my heavy equipment. I still have that old beast, thanks to yearly rustproofing, and it has around 528,000km on it.
In 1990 I bought a Toyota 4Runner with 3.0 V6. It ran Delvac 1 except for the 5 years I lived in Salt Lake City, when I ran Mobil 1 15W-50 year round (Easier to find and cheaper). Never used oil even with 16,000km OCI's and hard driving in the mountains.
In 1992 I bought a Honda Prelude SR and ran Delvac 1 with good results. In 1995 I tried a summer fill with Mobil 1 15W-50 and drove it on a road trip from home to Salt Lake City, through the South to Orlando Florida, then back home. Very quiet, no oil use, no difference in fuel economy.
In 2000 I ordered a GMC Sierra pickup with Vortec 5.3 litre V8. I run Mobil 1 0W-30 winter, and have played around with different summer grades. My best result was summer 2001 running Mobil 1 15W-50: no oil use, very quiet, no difference in fuel economy.
I have no hesitation using HDEO's or thicker oils in warmer temps. They protect the motor much better, especially HDEO's as they have to deal with high soot loads. My 1984 Ford is testimony to what a HDEO can do for a motor.
I plan on using Mobil 1 15W-50 in my GMC Sierra as a summer oil from now on.
Jerry
I ran Esso XD-3 15W-40 in summer and Esso XD-3 "Arctic" 0W-30 in winter, same as my heavy equipment.
In 1984 I got a new Ford pickup with 302 V8. It ran Delvac 1, same as my heavy equipment. I still have that old beast, thanks to yearly rustproofing, and it has around 528,000km on it.
In 1990 I bought a Toyota 4Runner with 3.0 V6. It ran Delvac 1 except for the 5 years I lived in Salt Lake City, when I ran Mobil 1 15W-50 year round (Easier to find and cheaper). Never used oil even with 16,000km OCI's and hard driving in the mountains.
In 1992 I bought a Honda Prelude SR and ran Delvac 1 with good results. In 1995 I tried a summer fill with Mobil 1 15W-50 and drove it on a road trip from home to Salt Lake City, through the South to Orlando Florida, then back home. Very quiet, no oil use, no difference in fuel economy.
In 2000 I ordered a GMC Sierra pickup with Vortec 5.3 litre V8. I run Mobil 1 0W-30 winter, and have played around with different summer grades. My best result was summer 2001 running Mobil 1 15W-50: no oil use, very quiet, no difference in fuel economy.
I have no hesitation using HDEO's or thicker oils in warmer temps. They protect the motor much better, especially HDEO's as they have to deal with high soot loads. My 1984 Ford is testimony to what a HDEO can do for a motor.
I plan on using Mobil 1 15W-50 in my GMC Sierra as a summer oil from now on.
Jerry