![]() ![]() ![]() Is there any evidence for this view witnessed by an increase in the number of engines going bang? I think not! If there were, the technical side of this forum would be full of unhappy people complaining, and asking how to measure crankpin ovality! On this forum, we have been saying for a while that the extended drain intervals are just a sop to the fleet buyers, and that it isn't good practice. If you change 99.9% or 99.99% of the old oil, it really isn't going to amount to a whole hill of beans of difference.Īs long as you change the oil at reasonable intervals, as specified by the manufacturer, and use the type and grade in your car's manual, and fit a decent filter, that's all there is to it. Hot or cold - doesn't make a huge amount of difference IMO, except it takes longer cold - go and have a cup of tea while it's draining! Remember, there's always going to be an oil gallery full of oil that you don't empty out whatever temperaturew you choose to do the draining at. ![]() Of course, the premise of the OP is wrong, oil doesn't get thicker when it is hot, that's not what the numbers on multigrade mean. Oil changes- hot or cold, sir? - Number_Cruncher
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