I am confused ... what is a cam? If you are talking about camshaft.. I first changed camlifters and keept the old camshaft . In 20 000 km had to replce again the camlifters cause they turned like old ones . So i changed camshaft too and since then everything is OK .
My advice is to spend extra 300 $ on a AE camshaft or 600$ for a original camshaft .Always replace bearings for the camshaft .
for non-english speakers is hard to understand some words... have mercy on us and be more explicit folks .
I have mounted the new camshaft(AE-federal mogul) +
camshaft bearings (la schalle - original parts) +
camlifters (INA )
in january .
Until today I have driven about 30 000 km .My car is over 400.000 km and first camlifter change was at 360 000 km ( somwhere around that milage).
Most of the time it was Aral 505.01 5-w40 oil . Betwen 300 to 400 000 km I used valvoline 5-w40 505.01 . Last 2 oil-changes I used Aral again . Las time it was 3 weeks ago .
I have noticed that engine starts smoother with valoline but I get an oil consumption of allmost 2 liters / 15000 km. When I use Aral the oil consumption drops down at 1.2-1.5 liter/15000 km .