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+--- Thread: Engine Oil 10w-40 or 5w-40? (/showthread.php?tid=31938)
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RE: Engine Oil 10w-40 or 5w-40? - Magenta Sunset - 20-09-2015
I'm using Comma 10w40 at da mo. seems ok
RE: Engine Oil 10w-40 or 5w-40? - Poodle - 21-09-2015
I have found 5w30 does cause leaks on older, poorly maintained engines. Unfortunately that description is appropriate to 90% of 306 diesels these days.
Steve is right, i find they run rather louder too, which will be due to the lower viscosity at operating temperatures.