Right planning on doing a service on my GSi this weekend and of course was wondering which oil is best to use, it has been on 5/30 the whole time the guy who owned before me told me, but then Iíve been reading on here the forís and againsts for running a GSi with the VXR turbo upgrade on 5/30. So I contacted Opie oils who said 5/40 maybe a better compromise. But to confuse the situation even further having read through quite a few threads on here about oils it seems to thin will blow past the seals, so Iím stuck please any help or input on peoples own experiences with oils would be great, what oil do you use???
Thanks in advance. Gavin