I am a firm believer in a good oil. Can't say about the quility of the halfords stuff but you get what you pay for. I would however stay away from any fully synthetic oil, most are to thin for old worn engines. The gaps in bearings etc are to big for the oil to give maximum protection and you will get a noisey engine. A semi synthetic oil is prob best as it is thicker and can work at the higher temps. Or just a good quality mineral oil GTX etc.
I did hear somwhere that GTX Magnatec is a waste of money on old engines as the cardon build up on surfaces stops it from sticking well, as magnatec is supposed to stay stuck. So stick with the normal.
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