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    When Did 5W/30 Become Mainstream in The US

    I believe 5W/30 was used in the winter in the US for many years but was changed in the summer to something heavier say 10W/40 as it would shear after a while. At what time did the oil technology improve to allow it to be used year round. In the UK there was little use of 5W/30 prior to say...
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    Aunty Betty or Similar Study Name

    Sorry for this question there was a study a good number of years ago by an oil company to look at how long engine oil would last if the person was only doing a small mileage every year. I think it was called Aunty Betty or something similar but a google search is not being productive. Can...
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    MX5 Miata Manual Transmission Diff Oil temperature

    After hard driving the new ND Miata / MX5 via additional sensors fitted to them are showing transmission temperatures of 150C / 302F The diffs are showing 160C / 320F and only has 0.6 litres/ 0.634 qtrs oil capacity. Can anyone advise if these temperatures will cause any problems or are the...
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    UOA in the UK

    Have any posters in the UK used UK testing houses or does everyone use Blackstone's in the US. Even with postage it is approx half the cost in the US compared to getting the oil tested the UK. eddie
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