I have been using Rotella 15-40 for years in all our motors except, the two late model ones that require synthetic.
In fact, I buy it by the barrel and extra filters. Mainly because of living rural and I don't have to make a trip to town to get the oil and filters.
An oil filter sure won't hurt to have also.

Wish I would have know that trick years ago Jerry. Spent many hours cleaning the sludge out of engines to rebuild.
Mainly as a kid helping Dad rebuild engines. I was the parts cleaner with a bucket of gas with no gloves.
Winter time, it was near the wood stove.

Don

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!