Hello people
taking the 'what oil is in your volvo' got me a little curious. I just went for my 1st service (10 000km) and I took with me castrol slx 0W-30 (the workshop said they needed 5litres)
checked with castrol and they said it should be fine to use the slx on S40 2.0T but because of the thin oil - some noise will be heard coming from the hydraulic tappets in the engine.
i have found the car to be smoother but notice that the engine noise may be a little harsher than before (my imagination?)
Anyhow any experience like this? btw, i live in a tropical country - avg temp is 34-37C.
Many thanks in advance
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