Do cars (apart from F1) and very high performance engines really need fully synthetic oils or is it a marketing ploy.
I use semi-synthetic with an oil change every 5000 miles but whether its really necessary I,m not so sure.
My cousin who ran his own HGV recently retired. His DAF lorry had done close to a million miles.
"What oil did you use Norm" says I. Expecting him to give me some brand name which he would extoll as the finest you can buy.... "The cheapest bloody oil I could find" was his reply. Anything he could find cheap he would use.
Yes I know that a lorry is running at lower revs and rarely runs cold, but still it makes you think....
Alvin
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