I'm not sure how to post, but having replaced the oil with a slightly thicker grade (but correct A5/B5 Spec) it's still doing it. Nothing when cold, but audible when hot from outside the car.
I think I'm going to replace the lifters before the rockers need doing as well. What make do people recommend? Also, what make swirl flap kit, with gaskets, do people use? There a real array of kits and different price points. Are PPS any good? Are the ones on Parts For Volvo's website any good?
Appreciate the info.
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