0W 40 or 15W 50
Having read all of the threads on oil I am now completely confused. I was considering two makes of oil, the Mobil 1 15W 50 or the Castrol RS 0W 40. I also heard someone mention Castrol RS 10W 60. Does this really exist or was it a mistype because I cannot find it anywhere. Which of the three oils is the best. I drive mostly on the motorway with some A/B road driving, but whichever it is I drive hard and fast(naughty I know!
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Last question. Is it better to use different grades for the summer and winter and if so which ones.
Cheers
Ed
)Last question. Is it better to use different grades for the summer and winter and if so which ones.
Cheers
Ed
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