QUOTE(stargate8 @ Jul 13 2012, 04:05 PM)
10W40 would be good enuf.
Edit: maybe he is high mileage driver
Unfortunately Proton Edar especially CoSE stock only Syn 1000 W50 for FS. If you want 40 or 30, only semi available. Thats why some ppl without the knowledge opt for the FS without realising the weight actually reduce the PICKUP quite noticeably.
W50 is good for older cars where the piston wall bore gap has worn and gap are larger thus require thicker lube. Its also good for cars that run high speed with very hot engine and its good for extreme hot weather (Saudi, etc). For Preve and other newer proton, I doub't we'll ever need 50 weighted lube unless its old.
Even tho its FS, the lube is too thick for balance FC saving and pickup power, so for me, its not worth it to change to weight 50 FS coz the the car will USUALLY be heavier on pickup and does not help in FC in order to reduce 1 service.
oh btw 5W does not mean better startup. There is no difference in 0W, 5W and 10W as it is winter rating, sub zero temperature, so 10W will act the same as 5W in our morning startup.
However the bigger difference in the gap between winter rating and original rating (5W40m, 0W40), more viscosity addictives is needed thus when it wears out, it will have bigger affect on your viscosity changes. One of the many reason I recommend lube changes BEFORE addictives runs out. When you do that, then any negative effects of caused by worn addictives is render irrelevant.
This post has been edited by Cavino: Jul 13 2012, 04:29 PM