This thread had been neglected, an unfortunate side effect of a crazy schedule; but the car has not! Recently changed the VANOS seals I got from the group buy, rattle kit was unused because it isn't needed. Pics and thoughts as follows:
Topless
Very happy to see it squeaky clean without a hint of sludge and varnish :top:
Cleaned and re-sealed VANOS unit
Old seals
Heard plenty of good things about Amsoil so I gave them a try this time around. Bought them for RM3XX for about 7 liters.
Very good service from the distributor, even delivered it to me at no cost.
While my old seals are hardened, it still maintains some of its elasticity and is not brittle. Doesn't crack even as I fold/bend/press/twist it. I vaguely remember the previous owner mentioning that he changed the seals but I'm not 100% sure about that..But if that's the case, it means that these Beisan seals might eventually harden and lose efficacy as well
With that being said, the difference is obvious. Before refreshing the seals, the car has little torque below 1.5k, picks up between 1.5 and ~3k, and only surges right after that. Also, when moving from a stop, the engine will bog a little and clutch engagement can be described as jerky.
All these went away right after the seal replacement. Engine is responsive and doesn't bog (I can even start from a go in 2nd gear!), torque below 3k rpm is restored and overall it became a very smooth and enjoyable drive. Can't really comment on fuel consumption improvement because I changed my regular route coincidentally.
I would definitely recommend seal replacement - at RM100 for the seals and ~RM250 for labor, I'd say its a no-brainer. Just get it done already!
Bonus pic: Achievement unlocked!