>> Bumped into an old mate last night! - haven't seen him for a few years,
>> and as usual got into a discussion about Oil. He reckons i'm being wasteful changing
>> my oil every 5000 mls, as semi-synthetic is good for 12000mls
Oil needs changing primarily because it is contaminated. Whether it is pure mineral, semi or fully synthetic, the change interval is the same.
Maybe some oils can deal better with contamination, but 'long life' oil sounds like a con to me.
If the car was used once a week and did 5000 miles, maybe leave it. If it's used daily, then change it - it will have more carp in it.
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