I got a PM about my post below. Our 78 - 403 works a little harder than most 403's. It pulls a 24ft enclosed car hauler. With a shop, and car inside. With a total weight in the 24,000 lbs range. The Royale is 12,000 lbs. of that. Total pulling Linda's life van comes in at 17,000 lbs. It's been 15 years since our GMC just pulled itself only. I personally rebuilt the trans in 2004. It's now in our second 78 Royale. Well over 100,000 miles. And still not rebuilt again.
Then I road race GM engines from the mid 60's. I run them in the 6 to 8,000 RPM range. Idle is at 2,200 RPMs. Head temps' approach 300 degrees. 13 to 1 compression range, 110 octane leaded gas that cost around $7.48 a gallon. At 3 miles to a gallon. That's $2.49 per mile. All day long. ( And you thought that your cost per mile was high in your GMC.)
The oil that I have blended isn't a synthetic. 10/30.
Bob Dunahugh
78 Royale since 2003.
4 COPO Yenkos
________________________________
From: Gmclist on behalf of Bob Dunahugh via Gmclist
Sent: Wednesday, January 27, 2021 12:52 AM
To: gmclist
Cc: Bob Dunahugh ; Corey
Subject: Re: [GMCnet] Shell Rotella T4 VOA
Nice to get that confirmation, Thank you for sharing. I get my oil in a 55-gallon barrel at a time. And have it blended to my own specs. It's close to the Rotella blend.
Bob Dunahugh
78 Royale since 2003.
Then I road race GM engines from the mid 60's. I run them in the 6 to 8,000 RPM range. Idle is at 2,200 RPMs. Head temps' approach 300 degrees. 13 to 1 compression range, 110 octane leaded gas that cost around $7.48 a gallon. At 3 miles to a gallon. That's $2.49 per mile. All day long. ( And you thought that your cost per mile was high in your GMC.)
The oil that I have blended isn't a synthetic. 10/30.
Bob Dunahugh
78 Royale since 2003.
4 COPO Yenkos
________________________________
From: Gmclist on behalf of Bob Dunahugh via Gmclist
Sent: Wednesday, January 27, 2021 12:52 AM
To: gmclist
Cc: Bob Dunahugh ; Corey
Subject: Re: [GMCnet] Shell Rotella T4 VOA
Nice to get that confirmation, Thank you for sharing. I get my oil in a 55-gallon barrel at a time. And have it blended to my own specs. It's close to the Rotella blend.
Bob Dunahugh
78 Royale since 2003.
