29-09-2020, 04:09 PM
Hi Howard,
By 'straight' do you mean non detergent/low detergent oil? 20w/50 is a multigrade, e.g. 30 or 40 weight would be straight oil which i believe can be bought both non detergent and detergent.
Views seems to vary on breaking an engine in. Bedding in the rings is the important thing IMHO and also the cam and followers if new.
I would certainly change at 50 miles though. After that a lot depends on your approach to breaking in. However I would not advocate being 'soft' on the engine. It needs revs under moderate load to bed the rings in, avoid idling for any length of time. Well bedded in rings will avoid bore galze and help keep oil consumtion reasonable as well as aiding optimum performance.
Sorry if this sounds a bit granny & eggs, but just in case its not.
By 'straight' do you mean non detergent/low detergent oil? 20w/50 is a multigrade, e.g. 30 or 40 weight would be straight oil which i believe can be bought both non detergent and detergent.
Views seems to vary on breaking an engine in. Bedding in the rings is the important thing IMHO and also the cam and followers if new.
I would certainly change at 50 miles though. After that a lot depends on your approach to breaking in. However I would not advocate being 'soft' on the engine. It needs revs under moderate load to bed the rings in, avoid idling for any length of time. Well bedded in rings will avoid bore galze and help keep oil consumtion reasonable as well as aiding optimum performance.
Sorry if this sounds a bit granny & eggs, but just in case its not.