17-10-2017, 06:18 PM
I re-built my engine a few months ago, and I have done about 300 miles or so since then, prior to this, the car returned to the road in 2015, and all I did in preparation for the engine was to thoroughly clean the internals, I didn't know how good or bad the engine was so ran it as it was for about 1,000 miles. When the bearing wear become too noisy to tolerate, i then did the re-build.
I had used a straight 30 SAE in those first 1,00 miles and I was shocked at the significant build-up of sludge in the sump and all over the crankcase walls, it was really dirty! All as if it had never been cleaned! Since the re-build, in order to assist with bedding in of new components I have used the same straight 30 SAE and I am about to do an oil change now the engine seems quite nicely run-in and this time I will put in a modern 20/50 (I use Comma) detergent oil, which should keep the internals much cleaner. The same oil I have used in my 1965 Rover P6 and I have done over 50,000 miles on a re-built engine and had cause to remove the sump a few weeks ago, the internals of that engine were still as clean as when first re-built, no sludge or nothing.
I had used a straight 30 SAE in those first 1,00 miles and I was shocked at the significant build-up of sludge in the sump and all over the crankcase walls, it was really dirty! All as if it had never been cleaned! Since the re-build, in order to assist with bedding in of new components I have used the same straight 30 SAE and I am about to do an oil change now the engine seems quite nicely run-in and this time I will put in a modern 20/50 (I use Comma) detergent oil, which should keep the internals much cleaner. The same oil I have used in my 1965 Rover P6 and I have done over 50,000 miles on a re-built engine and had cause to remove the sump a few weeks ago, the internals of that engine were still as clean as when first re-built, no sludge or nothing.